Refactor compatibility version code

Replace DefaultComponentGlobalsRegistry with new instance of componentGlobalsRegistry in test api server.

Signed-off-by: Siyuan Zhang <sizhang@google.com>

move kube effective version validation out of component base.

Signed-off-by: Siyuan Zhang <sizhang@google.com>

move DefaultComponentGlobalsRegistry out of component base.

Signed-off-by: Siyuan Zhang <sizhang@google.com>

move ComponentGlobalsRegistry out of featuregate pkg.

Signed-off-by: Siyuan Zhang <sizhang@google.com>

remove usage of DefaultComponentGlobalsRegistry in test files.

Signed-off-by: Siyuan Zhang <sizhang@google.com>

change non-test DefaultKubeEffectiveVersion to use DefaultBuildEffectiveVersion.

Signed-off-by: Siyuan Zhang <sizhang@google.com>

Restore useDefaultBuildBinaryVersion in effective version.

Signed-off-by: Siyuan Zhang <sizhang@google.com>

rename DefaultKubeEffectiveVersion to DefaultKubeEffectiveVersionForTest.

Signed-off-by: Siyuan Zhang <sizhang@google.com>

pass options.ComponentGlobalsRegistry into config for controller manager and scheduler.

Signed-off-by: Siyuan Zhang <sizhang@google.com>

Pass apiserver effective version to DefaultResourceEncodingConfig.

Signed-off-by: Siyuan Zhang <sizhang@google.com>

change statusz registry to take effective version from the components.

Signed-off-by: Siyuan Zhang <sizhang@google.com>

Address review comments

Signed-off-by: Siyuan Zhang <sizhang@google.com>

update vendor

Signed-off-by: Siyuan Zhang <sizhang@google.com>

cmd/kube-apiserver/app/options/options_test.go

@@ -35,10 +35,10 @@ import (
 	auditbuffered "k8s.io/apiserver/plugin/pkg/audit/buffered"
 	audittruncate "k8s.io/apiserver/plugin/pkg/audit/truncate"
 	cliflag "k8s.io/component-base/cli/flag"
+	basecompatibility "k8s.io/component-base/compatibility"
 	"k8s.io/component-base/featuregate"
 	"k8s.io/component-base/logs"
 	"k8s.io/component-base/metrics"
-	utilversion "k8s.io/component-base/version"
 	kapi "k8s.io/kubernetes/pkg/apis/core"
 	controlplaneapiserver "k8s.io/kubernetes/pkg/controlplane/apiserver/options"
 	"k8s.io/kubernetes/pkg/controlplane/reconcilers"
@@ -49,14 +49,12 @@ import (
 )
 
 func TestAddFlags(t *testing.T) {
-	componentGlobalsRegistry := featuregate.DefaultComponentGlobalsRegistry
+	componentGlobalsRegistry := basecompatibility.NewComponentGlobalsRegistry()
-	t.Cleanup(func() {
-		componentGlobalsRegistry.Reset()
-	})
 	fs := pflag.NewFlagSet("addflagstest", pflag.PanicOnError)
 
-	utilruntime.Must(componentGlobalsRegistry.Register("test", utilversion.NewEffectiveVersion("1.32"), featuregate.NewFeatureGate()))
+	utilruntime.Must(componentGlobalsRegistry.Register("test", basecompatibility.NewEffectiveVersionFromString("1.32", "1.31", "1.31"), featuregate.NewFeatureGate()))
 	s := NewServerRunOptions()
+	s.GenericServerRunOptions.ComponentGlobalsRegistry = componentGlobalsRegistry
 	for _, f := range s.Flags().FlagSets {
 		fs.AddFlagSet(f)
 	}
@@ -150,7 +148,7 @@ func TestAddFlags(t *testing.T) {
 				JSONPatchMaxCopyBytes:        int64(3 * 1024 * 1024),
 				MaxRequestBodyBytes:          int64(3 * 1024 * 1024),
 				ComponentGlobalsRegistry:     componentGlobalsRegistry,
-				ComponentName:                featuregate.DefaultKubeComponent,
+				ComponentName:                basecompatibility.DefaultKubeComponent,
 			},
 			Admission: &kubeoptions.AdmissionOptions{
 				GenericAdmission: &apiserveroptions.AdmissionOptions{

cmd/kube-apiserver/app/options/validation.go

@@ -24,7 +24,6 @@ import (
 
 	genericoptions "k8s.io/apiserver/pkg/server/options"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
-	utilversion "k8s.io/component-base/version"
 	netutils "k8s.io/utils/net"
 
 	controlplaneapiserver "k8s.io/kubernetes/pkg/controlplane/apiserver/options"
@@ -142,10 +141,5 @@ func (s CompletedOptions) Validate() []error {
 		errs = append(errs, fmt.Errorf("--apiserver-count should be a positive number, but value '%d' provided", s.MasterCount))
 	}
 
-	effectiveVersion := s.GenericServerRunOptions.ComponentGlobalsRegistry.EffectiveVersionFor(s.GenericServerRunOptions.ComponentName)
-	if err := utilversion.ValidateKubeEffectiveVersion(effectiveVersion); err != nil {
-		errs = append(errs, err)
-	}
-
 	return errs
 }

cmd/kube-apiserver/app/server.go

@@ -41,6 +41,7 @@ import (
 	"k8s.io/client-go/rest"
 	cliflag "k8s.io/component-base/cli/flag"
 	"k8s.io/component-base/cli/globalflag"
+	basecompatibility "k8s.io/component-base/compatibility"
 	"k8s.io/component-base/featuregate"
 	"k8s.io/component-base/logs"
 	logsapi "k8s.io/component-base/logs/api/v1"
@@ -64,10 +65,9 @@ func init() {
 
 // NewAPIServerCommand creates a *cobra.Command object with default parameters
 func NewAPIServerCommand() *cobra.Command {
-	_, featureGate := featuregate.DefaultComponentGlobalsRegistry.ComponentGlobalsOrRegister(
-		featuregate.DefaultKubeComponent, utilversion.DefaultBuildEffectiveVersion(), utilfeature.DefaultMutableFeatureGate)
 	s := options.NewServerRunOptions()
 	ctx := genericapiserver.SetupSignalContext()
+	featureGate := s.GenericServerRunOptions.ComponentGlobalsRegistry.FeatureGateFor(basecompatibility.DefaultKubeComponent)
 
 	cmd := &cobra.Command{
 		Use: "kube-apiserver",
@@ -79,7 +79,7 @@ cluster's shared state through which all other components interact.`,
 		// stop printing usage when the command errors
 		SilenceUsage: true,
 		PersistentPreRunE: func(*cobra.Command, []string) error {
-			if err := featuregate.DefaultComponentGlobalsRegistry.Set(); err != nil {
+			if err := s.GenericServerRunOptions.ComponentGlobalsRegistry.Set(); err != nil {
 				return err
 			}
 			// silence client-go warnings.
@@ -108,7 +108,7 @@ cluster's shared state through which all other components interact.`,
 				return utilerrors.NewAggregate(errs)
 			}
 			// add feature enablement metrics
-			featureGate.AddMetrics()
+			featureGate.(featuregate.MutableFeatureGate).AddMetrics()
 			return Run(ctx, completedOptions)
 		},
 		Args: func(cmd *cobra.Command, args []string) error {

cmd/kube-apiserver/app/testing/testserver.go

@@ -43,22 +43,20 @@ import (
 	"k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	utilerrors "k8s.io/apimachinery/pkg/util/errors"
-	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
-	"k8s.io/apimachinery/pkg/util/version"
 	"k8s.io/apimachinery/pkg/util/wait"
 	serveroptions "k8s.io/apiserver/pkg/server/options"
 	"k8s.io/apiserver/pkg/storage/storagebackend"
 	"k8s.io/apiserver/pkg/storageversion"
+	"k8s.io/apiserver/pkg/util/compatibility"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
 	"k8s.io/client-go/kubernetes"
 	restclient "k8s.io/client-go/rest"
 	clientgotransport "k8s.io/client-go/transport"
 	"k8s.io/client-go/util/cert"
 	"k8s.io/client-go/util/keyutil"
-	"k8s.io/component-base/featuregate"
+	basecompatibility "k8s.io/component-base/compatibility"
 	featuregatetesting "k8s.io/component-base/featuregate/testing"
 	logsapi "k8s.io/component-base/logs/api/v1"
-	utilversion "k8s.io/component-base/version"
 	"k8s.io/klog/v2"
 	"k8s.io/kube-aggregator/pkg/apiserver"
 	"k8s.io/kubernetes/pkg/features"
@@ -104,11 +102,8 @@ type TestServerInstanceOptions struct {
 	// an apiserver version skew scenario where all apiservers use the same proxyCA to verify client connections.
 	ProxyCA *ProxyCA
 	// Set the BinaryVersion of server effective version.
-	// If empty, effective version will default to version.DefaultKubeBinaryVersion.
+	// If empty, effective version will default to DefaultKubeEffectiveVersion.
 	BinaryVersion string
-	// Set the EmulationVersion of server effective version.
-	// If empty, emulation version will default to the effective version.
-	EmulationVersion string
 	// Set non-default request timeout in the server.
 	RequestTimeout time.Duration
 }
@@ -194,21 +189,20 @@ func StartTestServer(t ktesting.TB, instanceOptions *TestServerInstanceOptions,
 
 	fs := pflag.NewFlagSet("test", pflag.PanicOnError)
 
-	featureGate := utilfeature.DefaultMutableFeatureGate
+	featureGate := utilfeature.DefaultMutableFeatureGate.DeepCopy()
-	featureGate.AddMetrics()
+	effectiveVersion := compatibility.DefaultKubeEffectiveVersionForTest()
-	effectiveVersion := utilversion.DefaultKubeEffectiveVersion()
 	if instanceOptions.BinaryVersion != "" {
-		effectiveVersion = utilversion.NewEffectiveVersion(instanceOptions.BinaryVersion)
+		effectiveVersion = basecompatibility.NewEffectiveVersionFromString(instanceOptions.BinaryVersion, "", "")
 	}
-	if instanceOptions.EmulationVersion != "" {
+	effectiveVersion.SetEmulationVersion(featureGate.EmulationVersion())
-		effectiveVersion.SetEmulationVersion(version.MustParse(instanceOptions.EmulationVersion))
+	componentGlobalsRegistry := basecompatibility.NewComponentGlobalsRegistry()
+	if err := componentGlobalsRegistry.Register(basecompatibility.DefaultKubeComponent, effectiveVersion, featureGate); err != nil {
+		return result, err
 	}
-	// need to call SetFeatureGateEmulationVersionDuringTest to reset the feature gate emulation version at the end of the test.
-	featuregatetesting.SetFeatureGateEmulationVersionDuringTest(t, featureGate, effectiveVersion.EmulationVersion())
-	featuregate.DefaultComponentGlobalsRegistry.Reset()
-	utilruntime.Must(featuregate.DefaultComponentGlobalsRegistry.Register(featuregate.DefaultKubeComponent, effectiveVersion, featureGate))
 
 	s := options.NewServerRunOptions()
+	// set up new instance of ComponentGlobalsRegistry instead of using the DefaultComponentGlobalsRegistry to avoid contention in parallel tests.
+	s.Options.GenericServerRunOptions.ComponentGlobalsRegistry = componentGlobalsRegistry
 	if instanceOptions.RequestTimeout > 0 {
 		s.GenericServerRunOptions.RequestTimeout = instanceOptions.RequestTimeout
 	}
@@ -330,15 +324,6 @@ func StartTestServer(t ktesting.TB, instanceOptions *TestServerInstanceOptions,
 			return result, err
 		}
 		s.Authentication.ClientCert.ClientCA = clientCACertFile
-		if utilfeature.DefaultFeatureGate.Enabled(features.UnknownVersionInteroperabilityProxy) {
-			// TODO: set up a general clean up for testserver
-			if clientgotransport.DialerStopCh == wait.NeverStop {
-				ctx, cancel := context.WithTimeout(context.Background(), time.Hour)
-				t.Cleanup(cancel)
-				clientgotransport.DialerStopCh = ctx.Done()
-			}
-			s.PeerCAFile = filepath.Join(s.SecureServing.ServerCert.CertDirectory, s.SecureServing.ServerCert.PairName+".crt")
-		}
 	}
 
 	s.SecureServing.ExternalAddress = s.SecureServing.Listener.Addr().(*net.TCPAddr).IP // use listener addr although it is a loopback device
@@ -374,8 +359,32 @@ func StartTestServer(t ktesting.TB, instanceOptions *TestServerInstanceOptions,
 		s.Authentication.RequestHeader.ExtraHeaderPrefixes = extraHeaders
 	}
 
-	if err := featuregate.DefaultComponentGlobalsRegistry.Set(); err != nil {
+	if err := componentGlobalsRegistry.Set(); err != nil {
-		return result, err
+		return result, fmt.Errorf("%w\nIf you are using SetFeatureGate*DuringTest, try using --emulated-version and --feature-gates flags instead", err)
+	}
+	// If the local ComponentGlobalsRegistry is changed by the flags,
+	// we need to copy the new feature values back to the DefaultFeatureGate because most feature checks still use the DefaultFeatureGate.
+	// We cannot directly use DefaultFeatureGate in ComponentGlobalsRegistry because the changes done by ComponentGlobalsRegistry.Set() will not be undone at the end of the test.
+	if !featureGate.EmulationVersion().EqualTo(utilfeature.DefaultMutableFeatureGate.EmulationVersion()) {
+		featuregatetesting.SetFeatureGateEmulationVersionDuringTest(t, utilfeature.DefaultMutableFeatureGate, effectiveVersion.EmulationVersion())
+	}
+	for f := range utilfeature.DefaultMutableFeatureGate.GetAll() {
+		if featureGate.Enabled(f) != utilfeature.DefaultFeatureGate.Enabled(f) {
+			featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, f, featureGate.Enabled(f))
+		}
+	}
+	utilfeature.DefaultMutableFeatureGate.AddMetrics()
+
+	if instanceOptions.EnableCertAuth {
+		if featureGate.Enabled(features.UnknownVersionInteroperabilityProxy) {
+			// TODO: set up a general clean up for testserver
+			if clientgotransport.DialerStopCh == wait.NeverStop {
+				ctx, cancel := context.WithTimeout(context.Background(), time.Hour)
+				t.Cleanup(cancel)
+				clientgotransport.DialerStopCh = ctx.Done()
+			}
+			s.PeerCAFile = filepath.Join(s.SecureServing.ServerCert.CertDirectory, s.SecureServing.ServerCert.PairName+".crt")
+		}
 	}
 
 	saSigningKeyFile, err := os.CreateTemp("/tmp", "insecure_test_key")

cmd/kube-controller-manager/app/config/config.go

@@ -21,6 +21,7 @@ import (
 	clientset "k8s.io/client-go/kubernetes"
 	restclient "k8s.io/client-go/rest"
 	"k8s.io/client-go/tools/record"
+	basecompatibility "k8s.io/component-base/compatibility"
 	kubectrlmgrconfig "k8s.io/kubernetes/pkg/controller/apis/config"
 )
 
@@ -43,6 +44,9 @@ type Config struct {
 
 	EventBroadcaster record.EventBroadcaster
 	EventRecorder    record.EventRecorder
+
+	// ComponentGlobalsRegistry is the registry where the effective versions and feature gates for all components are stored.
+	ComponentGlobalsRegistry basecompatibility.ComponentGlobalsRegistry
 }
 
 type completedConfig struct {

cmd/kube-controller-manager/app/controllermanager.go

@@ -54,6 +54,7 @@ import (
 	"k8s.io/client-go/util/keyutil"
 	cliflag "k8s.io/component-base/cli/flag"
 	"k8s.io/component-base/cli/globalflag"
+	basecompatibility "k8s.io/component-base/compatibility"
 	"k8s.io/component-base/configz"
 	"k8s.io/component-base/featuregate"
 	"k8s.io/component-base/logs"
@@ -99,9 +100,6 @@ const (
 
 // NewControllerManagerCommand creates a *cobra.Command object with default parameters
 func NewControllerManagerCommand() *cobra.Command {
-	_, _ = featuregate.DefaultComponentGlobalsRegistry.ComponentGlobalsOrRegister(
-		featuregate.DefaultKubeComponent, utilversion.DefaultBuildEffectiveVersion(), utilfeature.DefaultMutableFeatureGate)
-
 	s, err := options.NewKubeControllerManagerOptions()
 	if err != nil {
 		klog.Background().Error(err, "Unable to initialize command options")
@@ -142,7 +140,7 @@ controller, and serviceaccounts controller.`,
 			}
 
 			// add feature enablement metrics
-			fg := s.ComponentGlobalsRegistry.FeatureGateFor(featuregate.DefaultKubeComponent)
+			fg := s.ComponentGlobalsRegistry.FeatureGateFor(basecompatibility.DefaultKubeComponent)
 			fg.(featuregate.MutableFeatureGate).AddMetrics()
 			return Run(context.Background(), c.Complete())
 		},
@@ -218,7 +216,7 @@ func Run(ctx context.Context, c *config.CompletedConfig) error {
 		slis.SLIMetricsWithReset{}.Install(unsecuredMux)
 
 		if utilfeature.DefaultFeatureGate.Enabled(zpagesfeatures.ComponentStatusz) {
-			statusz.Install(unsecuredMux, kubeControllerManager, statusz.NewRegistry())
+			statusz.Install(unsecuredMux, kubeControllerManager, statusz.NewRegistry(c.ComponentGlobalsRegistry.EffectiveVersionFor(basecompatibility.DefaultKubeComponent)))
 		}
 
 		handler := genericcontrollermanager.BuildHandlerChain(unsecuredMux, &c.Authorization, &c.Authentication)
@@ -289,11 +287,11 @@ func Run(ctx context.Context, c *config.CompletedConfig) error {
 	}
 
 	if utilfeature.DefaultFeatureGate.Enabled(kubefeatures.CoordinatedLeaderElection) {
-		binaryVersion, err := semver.ParseTolerant(featuregate.DefaultComponentGlobalsRegistry.EffectiveVersionFor(featuregate.DefaultKubeComponent).BinaryVersion().String())
+		binaryVersion, err := semver.ParseTolerant(c.ComponentGlobalsRegistry.EffectiveVersionFor(basecompatibility.DefaultKubeComponent).BinaryVersion().String())
 		if err != nil {
 			return err
 		}
-		emulationVersion, err := semver.ParseTolerant(featuregate.DefaultComponentGlobalsRegistry.EffectiveVersionFor(featuregate.DefaultKubeComponent).EmulationVersion().String())
+		emulationVersion, err := semver.ParseTolerant(c.ComponentGlobalsRegistry.EffectiveVersionFor(basecompatibility.DefaultKubeComponent).EmulationVersion().String())
 		if err != nil {
 			return err
 		}

cmd/kube-controller-manager/app/options/options.go

@@ -25,6 +25,7 @@ import (
 	utilerrors "k8s.io/apimachinery/pkg/util/errors"
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
 	apiserveroptions "k8s.io/apiserver/pkg/server/options"
+	"k8s.io/apiserver/pkg/util/compatibility"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
 	clientgofeaturegate "k8s.io/client-go/features"
 	clientset "k8s.io/client-go/kubernetes"
@@ -36,11 +37,11 @@ import (
 	cpnames "k8s.io/cloud-provider/names"
 	cpoptions "k8s.io/cloud-provider/options"
 	cliflag "k8s.io/component-base/cli/flag"
+	basecompatibility "k8s.io/component-base/compatibility"
 	"k8s.io/component-base/featuregate"
 	"k8s.io/component-base/logs"
 	logsapi "k8s.io/component-base/logs/api/v1"
 	"k8s.io/component-base/metrics"
-	utilversion "k8s.io/component-base/version"
 	cmoptions "k8s.io/controller-manager/options"
 	"k8s.io/klog/v2"
 	kubectrlmgrconfigv1alpha1 "k8s.io/kube-controller-manager/config/v1alpha1"
@@ -106,7 +107,7 @@ type KubeControllerManagerOptions struct {
 	ShowHiddenMetricsForVersion string
 
 	// ComponentGlobalsRegistry is the registry where the effective versions and feature gates for all components are stored.
-	ComponentGlobalsRegistry featuregate.ComponentGlobalsRegistry
+	ComponentGlobalsRegistry basecompatibility.ComponentGlobalsRegistry
 }
 
 // NewKubeControllerManagerOptions creates a new KubeControllerManagerOptions with a default config.
@@ -116,10 +117,12 @@ func NewKubeControllerManagerOptions() (*KubeControllerManagerOptions, error) {
 		return nil, err
 	}
 
-	if featuregate.DefaultComponentGlobalsRegistry.EffectiveVersionFor(featuregate.DefaultKubeComponent) == nil {
+	componentGlobalsRegistry := compatibility.DefaultComponentGlobalsRegistry
+
+	if componentGlobalsRegistry.EffectiveVersionFor(basecompatibility.DefaultKubeComponent) == nil {
 		featureGate := utilfeature.DefaultMutableFeatureGate
-		effectiveVersion := utilversion.DefaultKubeEffectiveVersion()
+		effectiveVersion := compatibility.DefaultBuildEffectiveVersion()
-		utilruntime.Must(featuregate.DefaultComponentGlobalsRegistry.Register(featuregate.DefaultKubeComponent, effectiveVersion, featureGate))
+		utilruntime.Must(componentGlobalsRegistry.Register(basecompatibility.DefaultKubeComponent, effectiveVersion, featureGate))
 	}
 
 	s := KubeControllerManagerOptions{
@@ -211,7 +214,7 @@ func NewKubeControllerManagerOptions() (*KubeControllerManagerOptions, error) {
 		Authorization:            apiserveroptions.NewDelegatingAuthorizationOptions(),
 		Metrics:                  metrics.NewOptions(),
 		Logs:                     logs.NewOptions(),
-		ComponentGlobalsRegistry: featuregate.DefaultComponentGlobalsRegistry,
+		ComponentGlobalsRegistry: componentGlobalsRegistry,
 	}
 
 	s.Authentication.RemoteKubeConfigFileOptional = true
@@ -230,7 +233,6 @@ func NewKubeControllerManagerOptions() (*KubeControllerManagerOptions, error) {
 	s.GarbageCollectorController.GCIgnoredResources = gcIgnoredResources
 	s.Generic.LeaderElection.ResourceName = "kube-controller-manager"
 	s.Generic.LeaderElection.ResourceNamespace = "kube-system"
-
 	return &s, nil
 }
 
@@ -452,7 +454,6 @@ func (s *KubeControllerManagerOptions) Validate(allControllers []string, disable
 	errs = append(errs, s.Authentication.Validate()...)
 	errs = append(errs, s.Authorization.Validate()...)
 	errs = append(errs, s.Metrics.Validate()...)
-	errs = append(errs, utilversion.ValidateKubeEffectiveVersion(s.ComponentGlobalsRegistry.EffectiveVersionFor(featuregate.DefaultKubeComponent)))
 
 	// in-tree cloud providers are disabled since v1.31 (KEP-2395)
 	if len(s.KubeCloudShared.CloudProvider.Name) > 0 && !cloudprovider.IsExternal(s.KubeCloudShared.CloudProvider.Name) {
@@ -502,6 +503,7 @@ func (s KubeControllerManagerOptions) Config(allControllers []string, disabledBy
 		Kubeconfig:               kubeconfig,
 		EventBroadcaster:         eventBroadcaster,
 		EventRecorder:            eventRecorder,
+		ComponentGlobalsRegistry: s.ComponentGlobalsRegistry,
 	}
 	if err := s.ApplyTo(c, allControllers, disabledByDefaultControllers, controllerAliases); err != nil {
 		return nil, err

cmd/kube-controller-manager/app/options/options_test.go

@@ -34,7 +34,7 @@ import (
 
 	"k8s.io/apiserver/pkg/apis/apiserver"
 	apiserveroptions "k8s.io/apiserver/pkg/server/options"
-	utilversion "k8s.io/component-base/version"
+	basecompatibility "k8s.io/component-base/compatibility"
 
 	componentbaseconfig "k8s.io/component-base/config"
 	"k8s.io/component-base/featuregate"
@@ -450,7 +450,8 @@ func TestAddFlags(t *testing.T) {
 		Master:  "192.168.4.20",
 		Metrics: &metrics.Options{},
 		Logs:    logs.NewOptions(),
-		ComponentGlobalsRegistry: featuregate.DefaultComponentGlobalsRegistry,
+		// ignores comparing ComponentGlobalsRegistry in this test.
+		ComponentGlobalsRegistry: s.ComponentGlobalsRegistry,
 	}
 
 	// Sort GCIgnoredResources because it's built from a map, which means the
@@ -736,27 +737,6 @@ func TestApplyTo(t *testing.T) {
 }
 
 func TestEmulatedVersion(t *testing.T) {
-	var cleanupAndSetupFunc = func() featuregate.FeatureGate {
-		componentGlobalsRegistry := featuregate.DefaultComponentGlobalsRegistry
-		componentGlobalsRegistry.Reset() // make sure this test have a clean state
-		t.Cleanup(func() {
-			componentGlobalsRegistry.Reset() // make sure this test doesn't leak a dirty state
-		})
-
-		verKube := utilversion.NewEffectiveVersion("1.32")
-		fg := featuregate.NewVersionedFeatureGate(version.MustParse("1.32"))
-		utilruntime.Must(fg.AddVersioned(map[featuregate.Feature]featuregate.VersionedSpecs{
-			"kubeA": {
-				{Version: version.MustParse("1.30"), Default: false, PreRelease: featuregate.Beta},
-				{Version: version.MustParse("1.32"), Default: true, LockToDefault: true, PreRelease: featuregate.GA},
-			},
-			"kubeB": {
-				{Version: version.MustParse("1.31"), Default: false, PreRelease: featuregate.Alpha},
-			},
-		}))
-		utilruntime.Must(componentGlobalsRegistry.Register(featuregate.DefaultKubeComponent, verKube, fg))
-		return fg
-	}
 
 	testcases := []struct {
 		name              string
@@ -808,9 +788,8 @@ func TestEmulatedVersion(t *testing.T) {
 
 	for _, tc := range testcases {
 		t.Run(tc.name, func(t *testing.T) {
-			fg := cleanupAndSetupFunc()
-
 			fs, s := setupControllerManagerFlagSet(t)
+			fg := s.ComponentGlobalsRegistry.FeatureGateFor(basecompatibility.DefaultKubeComponent)
 			err := fs.Parse(tc.flags)
 			checkTestError(t, err, false, "")
 			err = s.Validate([]string{""}, []string{""}, nil)
@@ -1558,6 +1537,22 @@ func setupControllerManagerFlagSet(t *testing.T) (*pflag.FlagSet, *KubeControlle
 		t.Fatal(fmt.Errorf("NewKubeControllerManagerOptions failed with %w", err))
 	}
 
+	componentGlobalsRegistry := basecompatibility.NewComponentGlobalsRegistry()
+
+	verKube := basecompatibility.NewEffectiveVersionFromString("1.32", "1.31", "1.31")
+	fg := featuregate.NewVersionedFeatureGate(version.MustParse("1.32"))
+	utilruntime.Must(fg.AddVersioned(map[featuregate.Feature]featuregate.VersionedSpecs{
+		"kubeA": {
+			{Version: version.MustParse("1.30"), Default: false, PreRelease: featuregate.Beta},
+			{Version: version.MustParse("1.32"), Default: true, LockToDefault: true, PreRelease: featuregate.GA},
+		},
+		"kubeB": {
+			{Version: version.MustParse("1.31"), Default: false, PreRelease: featuregate.Alpha},
+		},
+	}))
+	utilruntime.Must(componentGlobalsRegistry.Register(basecompatibility.DefaultKubeComponent, verKube, fg))
+	s.ComponentGlobalsRegistry = componentGlobalsRegistry
+
 	for _, f := range s.Flags([]string{""}, []string{""}, nil).FlagSets {
 		fs.AddFlagSet(f)
 	}

cmd/kube-proxy/app/server.go

@@ -42,6 +42,7 @@ import (
 	"k8s.io/apiserver/pkg/server/healthz"
 	"k8s.io/apiserver/pkg/server/mux"
 	"k8s.io/apiserver/pkg/server/routes"
+	"k8s.io/apiserver/pkg/util/compatibility"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
 	"k8s.io/client-go/informers"
 	clientset "k8s.io/client-go/kubernetes"
@@ -474,7 +475,7 @@ func serveMetrics(ctx context.Context, bindAddress string, proxyMode kubeproxyco
 	}
 
 	if utilfeature.DefaultFeatureGate.Enabled(zpagesfeatures.ComponentStatusz) {
-		statusz.Install(proxyMux, kubeProxy, statusz.NewRegistry())
+		statusz.Install(proxyMux, kubeProxy, statusz.NewRegistry(compatibility.DefaultBuildEffectiveVersion()))
 	}
 
 	fn := func() {

cmd/kube-scheduler/app/config/config.go

@@ -26,6 +26,7 @@ import (
 	restclient "k8s.io/client-go/rest"
 	"k8s.io/client-go/tools/events"
 	"k8s.io/client-go/tools/leaderelection"
+	basecompatibility "k8s.io/component-base/compatibility"
 	"k8s.io/component-base/zpages/flagz"
 	kubeschedulerconfig "k8s.io/kubernetes/pkg/scheduler/apis/config"
 )
@@ -61,6 +62,9 @@ type Config struct {
 	// value, the pod will be moved from unschedulablePods to backoffQ or activeQ.
 	// If this value is empty, the default value (5min) will be used.
 	PodMaxInUnschedulablePodsDuration time.Duration
+
+	// ComponentGlobalsRegistry is the registry where the effective versions and feature gates for all components are stored.
+	ComponentGlobalsRegistry basecompatibility.ComponentGlobalsRegistry
 }
 
 type completedConfig struct {

cmd/kube-scheduler/app/options/options.go

@@ -28,6 +28,7 @@ import (
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
 	"k8s.io/apimachinery/pkg/util/uuid"
 	apiserveroptions "k8s.io/apiserver/pkg/server/options"
+	"k8s.io/apiserver/pkg/util/compatibility"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
 	"k8s.io/client-go/dynamic"
 	"k8s.io/client-go/dynamic/dynamicinformer"
@@ -39,13 +40,12 @@ import (
 	"k8s.io/client-go/tools/leaderelection/resourcelock"
 	"k8s.io/client-go/tools/record"
 	cliflag "k8s.io/component-base/cli/flag"
+	basecompatibility "k8s.io/component-base/compatibility"
 	componentbaseconfig "k8s.io/component-base/config"
 	"k8s.io/component-base/config/options"
-	"k8s.io/component-base/featuregate"
 	"k8s.io/component-base/logs"
 	logsapi "k8s.io/component-base/logs/api/v1"
 	"k8s.io/component-base/metrics"
-	utilversion "k8s.io/component-base/version"
 	zpagesfeatures "k8s.io/component-base/zpages/features"
 	"k8s.io/component-base/zpages/flagz"
 	"k8s.io/klog/v2"
@@ -78,7 +78,7 @@ type Options struct {
 	Master string
 
 	// ComponentGlobalsRegistry is the registry where the effective versions and feature gates for all components are stored.
-	ComponentGlobalsRegistry featuregate.ComponentGlobalsRegistry
+	ComponentGlobalsRegistry basecompatibility.ComponentGlobalsRegistry
 
 	// Flags hold the parsed CLI flags.
 	Flags *cliflag.NamedFlagSets
@@ -86,12 +86,17 @@ type Options struct {
 
 // NewOptions returns default scheduler app options.
 func NewOptions() *Options {
+	componentGlobalsRegistry := compatibility.DefaultComponentGlobalsRegistry
 	// make sure DefaultKubeComponent is registered in the DefaultComponentGlobalsRegistry.
-	if featuregate.DefaultComponentGlobalsRegistry.EffectiveVersionFor(featuregate.DefaultKubeComponent) == nil {
+	if componentGlobalsRegistry.EffectiveVersionFor(basecompatibility.DefaultKubeComponent) == nil {
 		featureGate := utilfeature.DefaultMutableFeatureGate
-		effectiveVersion := utilversion.DefaultKubeEffectiveVersion()
+		effectiveVersion := compatibility.DefaultBuildEffectiveVersion()
-		utilruntime.Must(featuregate.DefaultComponentGlobalsRegistry.Register(featuregate.DefaultKubeComponent, effectiveVersion, featureGate))
+		utilruntime.Must(componentGlobalsRegistry.Register(basecompatibility.DefaultKubeComponent, effectiveVersion, featureGate))
 	}
+	return NewOptionsWithComponentGlobalsRegistry(componentGlobalsRegistry)
+}
+
+func NewOptionsWithComponentGlobalsRegistry(componentGlobalsRegistry basecompatibility.ComponentGlobalsRegistry) *Options {
 	o := &Options{
 		SecureServing:  apiserveroptions.NewSecureServingOptions().WithLoopback(),
 		Authentication: apiserveroptions.NewDelegatingAuthenticationOptions(),
@@ -110,7 +115,7 @@ func NewOptions() *Options {
 		},
 		Metrics:                  metrics.NewOptions(),
 		Logs:                     logs.NewOptions(),
-		ComponentGlobalsRegistry: featuregate.DefaultComponentGlobalsRegistry,
+		ComponentGlobalsRegistry: componentGlobalsRegistry,
 	}
 
 	o.Authentication.TolerateInClusterLookupFailure = true
@@ -287,11 +292,6 @@ func (o *Options) Validate() []error {
 	errs = append(errs, o.Authorization.Validate()...)
 	errs = append(errs, o.Metrics.Validate()...)
 
-	effectiveVersion := o.ComponentGlobalsRegistry.EffectiveVersionFor(featuregate.DefaultKubeComponent)
-	if err := utilversion.ValidateKubeEffectiveVersion(effectiveVersion); err != nil {
-		errs = append(errs, err)
-	}
-
 	return errs
 }
 
@@ -337,6 +337,7 @@ func (o *Options) Config(ctx context.Context) (*schedulerappconfig.Config, error
 	dynClient := dynamic.NewForConfigOrDie(c.KubeConfig)
 	c.DynInformerFactory = dynamicinformer.NewFilteredDynamicSharedInformerFactory(dynClient, 0, corev1.NamespaceAll, nil)
 	c.LeaderElection = leaderElectionConfig
+	c.ComponentGlobalsRegistry = o.ComponentGlobalsRegistry
 
 	return c, nil
 }

cmd/kube-scheduler/app/options/options_test.go

@@ -32,8 +32,8 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 	apiserveroptions "k8s.io/apiserver/pkg/server/options"
+	basecompatibility "k8s.io/component-base/compatibility"
 	componentbaseconfig "k8s.io/component-base/config"
-	"k8s.io/component-base/featuregate"
 	"k8s.io/component-base/logs"
 	"k8s.io/klog/v2/ktesting"
 	v1 "k8s.io/kube-scheduler/config/v1"
@@ -282,6 +282,8 @@ profiles:
 	defaultPodMaxBackoffSeconds := int64(10)
 	defaultPercentageOfNodesToScore := ptr.To[int32](0)
 
+	componentGlobalsRegistry := basecompatibility.NewComponentGlobalsRegistry()
+
 	testcases := []struct {
 		name             string
 		options          *Options
@@ -323,7 +325,7 @@ profiles:
 					AlwaysAllowGroups:            []string{"system:masters"},
 				},
 				Logs:                     logs.NewOptions(),
-				ComponentGlobalsRegistry: featuregate.DefaultComponentGlobalsRegistry,
+				ComponentGlobalsRegistry: componentGlobalsRegistry,
 			},
 			expectedUsername: "config",
 			expectedConfig: kubeschedulerconfig.KubeSchedulerConfiguration{
@@ -375,7 +377,7 @@ profiles:
 					return cfg
 				}(),
 				Logs:                     logs.NewOptions(),
-				ComponentGlobalsRegistry: featuregate.DefaultComponentGlobalsRegistry,
+				ComponentGlobalsRegistry: componentGlobalsRegistry,
 			},
 			expectedError: "no kind \"KubeSchedulerConfiguration\" is registered for version \"componentconfig/v1alpha1\"",
 		},
@@ -384,7 +386,7 @@ profiles:
 			options: &Options{
 				ConfigFile:               unknownVersionConfig,
 				Logs:                     logs.NewOptions(),
-				ComponentGlobalsRegistry: featuregate.DefaultComponentGlobalsRegistry,
+				ComponentGlobalsRegistry: componentGlobalsRegistry,
 			},
 			expectedError: "no kind \"KubeSchedulerConfiguration\" is registered for version \"kubescheduler.config.k8s.io/unknown\"",
 		},
@@ -393,7 +395,7 @@ profiles:
 			options: &Options{
 				ConfigFile:               noVersionConfig,
 				Logs:                     logs.NewOptions(),
-				ComponentGlobalsRegistry: featuregate.DefaultComponentGlobalsRegistry,
+				ComponentGlobalsRegistry: componentGlobalsRegistry,
 			},
 			expectedError: "Object 'apiVersion' is missing",
 		},
@@ -430,7 +432,7 @@ profiles:
 					AlwaysAllowGroups:            []string{"system:masters"},
 				},
 				Logs:                     logs.NewOptions(),
-				ComponentGlobalsRegistry: featuregate.DefaultComponentGlobalsRegistry,
+				ComponentGlobalsRegistry: componentGlobalsRegistry,
 			},
 			expectedUsername: "flag",
 			expectedConfig: kubeschedulerconfig.KubeSchedulerConfiguration{
@@ -503,7 +505,7 @@ profiles:
 					AlwaysAllowGroups:            []string{"system:masters"},
 				},
 				Logs:                     logs.NewOptions(),
-				ComponentGlobalsRegistry: featuregate.DefaultComponentGlobalsRegistry,
+				ComponentGlobalsRegistry: componentGlobalsRegistry,
 			},
 			expectedConfig: kubeschedulerconfig.KubeSchedulerConfiguration{
 				TypeMeta: metav1.TypeMeta{
@@ -548,7 +550,7 @@ profiles:
 			options: &Options{
 				ConfigFile:               pluginConfigFile,
 				Logs:                     logs.NewOptions(),
-				ComponentGlobalsRegistry: featuregate.DefaultComponentGlobalsRegistry,
+				ComponentGlobalsRegistry: componentGlobalsRegistry,
 			},
 			expectedUsername: "config",
 			expectedConfig: kubeschedulerconfig.KubeSchedulerConfiguration{
@@ -669,7 +671,7 @@ profiles:
 			options: &Options{
 				ConfigFile:               multiProfilesConfig,
 				Logs:                     logs.NewOptions(),
-				ComponentGlobalsRegistry: featuregate.DefaultComponentGlobalsRegistry,
+				ComponentGlobalsRegistry: componentGlobalsRegistry,
 			},
 			expectedUsername: "config",
 			expectedConfig: kubeschedulerconfig.KubeSchedulerConfiguration{
@@ -784,7 +786,7 @@ profiles:
 			name: "no config",
 			options: &Options{
 				Logs:                     logs.NewOptions(),
-				ComponentGlobalsRegistry: featuregate.DefaultComponentGlobalsRegistry,
+				ComponentGlobalsRegistry: componentGlobalsRegistry,
 			},
 			expectedError: "no configuration has been provided",
 		},
@@ -793,7 +795,7 @@ profiles:
 			options: &Options{
 				ConfigFile:               unknownFieldConfig,
 				Logs:                     logs.NewOptions(),
-				ComponentGlobalsRegistry: featuregate.DefaultComponentGlobalsRegistry,
+				ComponentGlobalsRegistry: componentGlobalsRegistry,
 			},
 			expectedError: `unknown field "foo"`,
 			checkErrFn:    runtime.IsStrictDecodingError,
@@ -803,7 +805,7 @@ profiles:
 			options: &Options{
 				ConfigFile:               duplicateFieldConfig,
 				Logs:                     logs.NewOptions(),
-				ComponentGlobalsRegistry: featuregate.DefaultComponentGlobalsRegistry,
+				ComponentGlobalsRegistry: componentGlobalsRegistry,
 			},
 			expectedError: `key "leaderElect" already set`,
 			checkErrFn:    runtime.IsStrictDecodingError,
@@ -813,7 +815,7 @@ profiles:
 			options: &Options{
 				ConfigFile:               highThroughputProfileConfig,
 				Logs:                     logs.NewOptions(),
-				ComponentGlobalsRegistry: featuregate.DefaultComponentGlobalsRegistry,
+				ComponentGlobalsRegistry: componentGlobalsRegistry,
 			},
 			expectedUsername: "config",
 			expectedConfig: kubeschedulerconfig.KubeSchedulerConfiguration{

cmd/kube-scheduler/app/server.go

@@ -46,6 +46,7 @@ import (
 	"k8s.io/client-go/tools/leaderelection"
 	cliflag "k8s.io/component-base/cli/flag"
 	"k8s.io/component-base/cli/globalflag"
+	basecompatibility "k8s.io/component-base/compatibility"
 	"k8s.io/component-base/configz"
 	"k8s.io/component-base/featuregate"
 	"k8s.io/component-base/logs"
@@ -84,10 +85,6 @@ type Option func(runtime.Registry) error
 
 // NewSchedulerCommand creates a *cobra.Command object with default parameters and registryOptions
 func NewSchedulerCommand(registryOptions ...Option) *cobra.Command {
-	// explicitly register (if not already registered) the kube effective version and feature gate in DefaultComponentGlobalsRegistry,
-	// which will be used in NewOptions.
-	_, _ = featuregate.DefaultComponentGlobalsRegistry.ComponentGlobalsOrRegister(
-		featuregate.DefaultKubeComponent, utilversion.DefaultBuildEffectiveVersion(), utilfeature.DefaultMutableFeatureGate)
 	opts := options.NewOptions()
 
 	cmd := &cobra.Command{
@@ -138,7 +135,7 @@ for more information about scheduling and the kube-scheduler component.`,
 // runCommand runs the scheduler.
 func runCommand(cmd *cobra.Command, opts *options.Options, registryOptions ...Option) error {
 	verflag.PrintAndExitIfRequested()
-	fg := opts.ComponentGlobalsRegistry.FeatureGateFor(featuregate.DefaultKubeComponent)
+	fg := opts.ComponentGlobalsRegistry.FeatureGateFor(basecompatibility.DefaultKubeComponent)
 	// Activate logging as soon as possible, after that
 	// show flags with the final logging configuration.
 	if err := logsapi.ValidateAndApply(opts.Logs, fg); err != nil {
@@ -216,11 +213,11 @@ func Run(ctx context.Context, cc *schedulerserverconfig.CompletedConfig, sched *
 	readyzChecks = append(readyzChecks, handlerSyncCheck)
 
 	if cc.LeaderElection != nil && utilfeature.DefaultFeatureGate.Enabled(kubefeatures.CoordinatedLeaderElection) {
-		binaryVersion, err := semver.ParseTolerant(featuregate.DefaultComponentGlobalsRegistry.EffectiveVersionFor(featuregate.DefaultKubeComponent).BinaryVersion().String())
+		binaryVersion, err := semver.ParseTolerant(cc.ComponentGlobalsRegistry.EffectiveVersionFor(basecompatibility.DefaultKubeComponent).BinaryVersion().String())
 		if err != nil {
 			return err
 		}
-		emulationVersion, err := semver.ParseTolerant(featuregate.DefaultComponentGlobalsRegistry.EffectiveVersionFor(featuregate.DefaultKubeComponent).EmulationVersion().String())
+		emulationVersion, err := semver.ParseTolerant(cc.ComponentGlobalsRegistry.EffectiveVersionFor(basecompatibility.DefaultKubeComponent).EmulationVersion().String())
 		if err != nil {
 			return err
 		}

cmd/kube-scheduler/app/server_test.go

@@ -36,10 +36,10 @@ import (
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
 	"k8s.io/apimachinery/pkg/util/version"
 	"k8s.io/apiserver/pkg/util/feature"
+	basecompatibility "k8s.io/component-base/compatibility"
 	componentbaseconfig "k8s.io/component-base/config"
 	"k8s.io/component-base/featuregate"
 	featuregatetesting "k8s.io/component-base/featuregate/testing"
-	utilversion "k8s.io/component-base/version"
 	configv1 "k8s.io/kube-scheduler/config/v1"
 	"k8s.io/kubernetes/cmd/kube-scheduler/app/options"
 	"k8s.io/kubernetes/pkg/features"
@@ -438,12 +438,8 @@ leaderElection:
 			for k, v := range tc.restoreFeatures {
 				featuregatetesting.SetFeatureGateDuringTest(t, feature.DefaultFeatureGate, k, v)
 			}
-			componentGlobalsRegistry := featuregate.DefaultComponentGlobalsRegistry
+			componentGlobalsRegistry := basecompatibility.NewComponentGlobalsRegistry()
-			t.Cleanup(func() {
+			verKube := basecompatibility.NewEffectiveVersionFromString("1.32", "1.31", "1.31")
-				componentGlobalsRegistry.Reset()
-			})
-			componentGlobalsRegistry.Reset()
-			verKube := utilversion.NewEffectiveVersion("1.32")
 			fg := feature.DefaultFeatureGate.DeepCopy()
 			utilruntime.Must(fg.AddVersioned(map[featuregate.Feature]featuregate.VersionedSpecs{
 				"kubeA": {
@@ -454,10 +450,10 @@ leaderElection:
 					{Version: version.MustParse("1.31"), Default: false, PreRelease: featuregate.Alpha},
 				},
 			}))
-			utilruntime.Must(componentGlobalsRegistry.Register(featuregate.DefaultKubeComponent, verKube, fg))
+			utilruntime.Must(componentGlobalsRegistry.Register(basecompatibility.DefaultKubeComponent, verKube, fg))
 
 			fs := pflag.NewFlagSet("test", pflag.PanicOnError)
-			opts := options.NewOptions()
+			opts := options.NewOptionsWithComponentGlobalsRegistry(componentGlobalsRegistry)
 
 			// use listeners instead of static ports so parallel test runs don't conflict
 			opts.SecureServing.Listener = makeListener(t)

pkg/controlplane/apiserver/config.go

@@ -189,8 +189,7 @@ func BuildGenericConfig(
 		s.Etcd.StorageConfig.Transport.TracerProvider = noopoteltrace.NewTracerProvider()
 	}
 
-	storageFactoryConfig := kubeapiserver.NewStorageFactoryConfig()
+	storageFactoryConfig := kubeapiserver.NewStorageFactoryConfigEffectiveVersion(genericConfig.EffectiveVersion)
-	storageFactoryConfig.CurrentVersion = genericConfig.EffectiveVersion
 	storageFactoryConfig.APIResourceConfig = genericConfig.MergedResourceConfig
 	storageFactoryConfig.DefaultResourceEncoding.SetEffectiveVersion(genericConfig.EffectiveVersion)
 	storageFactory, lastErr = storageFactoryConfig.Complete(s.Etcd).New()

pkg/controlplane/apiserver/options/options_test.go

@@ -40,10 +40,10 @@ import (
 	auditbuffered "k8s.io/apiserver/plugin/pkg/audit/buffered"
 	audittruncate "k8s.io/apiserver/plugin/pkg/audit/truncate"
 	cliflag "k8s.io/component-base/cli/flag"
+	basecompatibility "k8s.io/component-base/compatibility"
 	"k8s.io/component-base/featuregate"
 	"k8s.io/component-base/logs"
 	"k8s.io/component-base/metrics"
-	utilversion "k8s.io/component-base/version"
 	kubeoptions "k8s.io/kubernetes/pkg/kubeapiserver/options"
 	"k8s.io/kubernetes/pkg/serviceaccount"
 	v1alpha1testing "k8s.io/kubernetes/pkg/serviceaccount/externaljwt/plugin/testing/v1alpha1"
@@ -51,13 +51,11 @@ import (
 )
 
 func TestAddFlags(t *testing.T) {
-	componentGlobalsRegistry := featuregate.DefaultComponentGlobalsRegistry
+	componentGlobalsRegistry := basecompatibility.NewComponentGlobalsRegistry()
-	t.Cleanup(func() {
-		componentGlobalsRegistry.Reset()
-	})
 	fs := pflag.NewFlagSet("addflagstest", pflag.PanicOnError)
-	utilruntime.Must(componentGlobalsRegistry.Register("test", utilversion.NewEffectiveVersion("1.32"), featuregate.NewFeatureGate()))
+	utilruntime.Must(componentGlobalsRegistry.Register("test", basecompatibility.NewEffectiveVersionFromString("1.32", "1.31", "1.31"), featuregate.NewFeatureGate()))
 	s := NewOptions()
+	s.GenericServerRunOptions.ComponentGlobalsRegistry = componentGlobalsRegistry
 	var fss cliflag.NamedFlagSets
 	s.AddFlags(&fss)
 	for _, f := range fss.FlagSets {
@@ -141,7 +139,7 @@ func TestAddFlags(t *testing.T) {
 			JSONPatchMaxCopyBytes:        int64(3 * 1024 * 1024),
 			MaxRequestBodyBytes:          int64(3 * 1024 * 1024),
 			ComponentGlobalsRegistry:     componentGlobalsRegistry,
-			ComponentName:                featuregate.DefaultKubeComponent,
+			ComponentName:                basecompatibility.DefaultKubeComponent,
 		},
 		Admission: &kubeoptions.AdmissionOptions{
 			GenericAdmission: &apiserveroptions.AdmissionOptions{

pkg/controlplane/apiserver/options/validation_test.go

@@ -25,6 +25,7 @@ import (
 	kubeapiserveradmission "k8s.io/apiserver/pkg/admission"
 	genericoptions "k8s.io/apiserver/pkg/server/options"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
+	basecompatibility "k8s.io/component-base/compatibility"
 	"k8s.io/component-base/featuregate"
 	basemetrics "k8s.io/component-base/metrics"
 	"k8s.io/kubernetes/pkg/features"
@@ -202,7 +203,7 @@ func TestValidateOptions(t *testing.T) {
 			name:         "validate master count equal 0",
 			expectErrors: true,
 			options: &Options{
-				GenericServerRunOptions: &genericoptions.ServerRunOptions{ComponentGlobalsRegistry: featuregate.DefaultComponentGlobalsRegistry},
+				GenericServerRunOptions: &genericoptions.ServerRunOptions{ComponentGlobalsRegistry: basecompatibility.NewComponentGlobalsRegistry()},
 				Etcd:                    &genericoptions.EtcdOptions{},
 				SecureServing:           &genericoptions.SecureServingOptionsWithLoopback{},
 				Audit:                   &genericoptions.AuditOptions{},
@@ -229,7 +230,7 @@ func TestValidateOptions(t *testing.T) {
 			name:         "validate token request enable not attempted",
 			expectErrors: true,
 			options: &Options{
-				GenericServerRunOptions: &genericoptions.ServerRunOptions{ComponentGlobalsRegistry: featuregate.DefaultComponentGlobalsRegistry},
+				GenericServerRunOptions: &genericoptions.ServerRunOptions{ComponentGlobalsRegistry: basecompatibility.NewComponentGlobalsRegistry()},
 				Etcd:                    &genericoptions.EtcdOptions{},
 				SecureServing:           &genericoptions.SecureServingOptionsWithLoopback{},
 				Audit:                   &genericoptions.AuditOptions{},

pkg/controlplane/apiserver/server.go

@@ -161,7 +161,7 @@ func (c completedConfig) New(name string, delegationTarget genericapiserver.Dele
 	}
 
 	if utilfeature.DefaultFeatureGate.Enabled(zpagesfeatures.ComponentStatusz) {
-		statusz.Install(s.GenericAPIServer.Handler.NonGoRestfulMux, name, statusz.NewRegistry())
+		statusz.Install(s.GenericAPIServer.Handler.NonGoRestfulMux, name, statusz.NewRegistry(c.Generic.EffectiveVersion))
 	}
 
 	if utilfeature.DefaultFeatureGate.Enabled(apiserverfeatures.CoordinatedLeaderElection) {

pkg/controlplane/instance_test.go

@@ -55,6 +55,7 @@ import (
 	"k8s.io/apiserver/pkg/server/resourceconfig"
 	serverstorage "k8s.io/apiserver/pkg/server/storage"
 	etcd3testing "k8s.io/apiserver/pkg/storage/etcd3/testing"
+	"k8s.io/apiserver/pkg/util/compatibility"
 	"k8s.io/apiserver/pkg/util/openapi"
 	"k8s.io/client-go/discovery"
 	"k8s.io/client-go/informers"
@@ -103,7 +104,7 @@ func setUp(t *testing.T) (*etcd3testing.EtcdTestServer, Config, *assert.Assertio
 		},
 	}
 
-	config.ControlPlane.Generic.EffectiveVersion = utilversion.DefaultKubeEffectiveVersion()
+	config.ControlPlane.Generic.EffectiveVersion = compatibility.DefaultKubeEffectiveVersionForTest()
 	storageFactoryConfig := kubeapiserver.NewStorageFactoryConfig()
 	storageFactoryConfig.DefaultResourceEncoding.SetEffectiveVersion(config.ControlPlane.Generic.EffectiveVersion)
 	storageConfig.StorageObjectCountTracker = config.ControlPlane.Generic.StorageObjectCountTracker
@@ -241,7 +242,7 @@ func TestVersion(t *testing.T) {
 		t.Errorf("unexpected error: %v", err)
 	}
 	expectedInfo := utilversion.Get()
-	kubeVersion := utilversion.DefaultKubeEffectiveVersion().BinaryVersion()
+	kubeVersion := compatibility.DefaultKubeEffectiveVersionForTest().BinaryVersion()
 	expectedInfo.Major = fmt.Sprintf("%d", kubeVersion.Major())
 	expectedInfo.Minor = fmt.Sprintf("%d", kubeVersion.Minor())
 

pkg/kubeapiserver/default_storage_factory_builder.go

@@ -25,7 +25,8 @@ import (
 	"k8s.io/apiserver/pkg/server/resourceconfig"
 	serverstorage "k8s.io/apiserver/pkg/server/storage"
 	"k8s.io/apiserver/pkg/storage/storagebackend"
-	version "k8s.io/component-base/version"
+	"k8s.io/apiserver/pkg/util/compatibility"
+	basecompatibility "k8s.io/component-base/compatibility"
 	"k8s.io/kubernetes/pkg/api/legacyscheme"
 	"k8s.io/kubernetes/pkg/apis/admissionregistration"
 	"k8s.io/kubernetes/pkg/apis/apps"
@@ -61,6 +62,11 @@ func DefaultWatchCacheSizes() map[schema.GroupResource]int {
 
 // NewStorageFactoryConfig returns a new StorageFactoryConfig set up with necessary resource overrides.
 func NewStorageFactoryConfig() *StorageFactoryConfig {
+	return NewStorageFactoryConfigEffectiveVersion(compatibility.DefaultComponentGlobalsRegistry.EffectiveVersionFor(basecompatibility.DefaultKubeComponent))
+}
+
+// NewStorageFactoryConfigEffectiveVersion returns a new StorageFactoryConfig set up with necessary resource overrides for a given EffectiveVersion.
+func NewStorageFactoryConfigEffectiveVersion(effectiveVersion basecompatibility.EffectiveVersion) *StorageFactoryConfig {
 	resources := []schema.GroupVersionResource{
 		// If a resource has to be stored in a version that is not the
 		// latest, then it can be listed here. Usually this is the case
@@ -87,7 +93,7 @@ func NewStorageFactoryConfig() *StorageFactoryConfig {
 
 	return &StorageFactoryConfig{
 		Serializer:                legacyscheme.Codecs,
-		DefaultResourceEncoding:   serverstorage.NewDefaultResourceEncodingConfig(legacyscheme.Scheme),
+		DefaultResourceEncoding:   serverstorage.NewDefaultResourceEncodingConfigForEffectiveVersion(legacyscheme.Scheme, effectiveVersion),
 		ResourceEncodingOverrides: resources,
 	}
 }
@@ -101,7 +107,6 @@ type StorageFactoryConfig struct {
 	Serializer                runtime.StorageSerializer
 	ResourceEncodingOverrides []schema.GroupVersionResource
 	EtcdServersOverrides      []string
-	CurrentVersion            version.EffectiveVersion
 }
 
 // Complete completes the StorageFactoryConfig with provided etcdOptions returning completedStorageFactoryConfig.

pkg/kubelet/server/server.go

@@ -59,6 +59,7 @@ import (
 	"k8s.io/apiserver/pkg/server/healthz"
 	"k8s.io/apiserver/pkg/server/httplog"
 	"k8s.io/apiserver/pkg/server/routes"
+	"k8s.io/apiserver/pkg/util/compatibility"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
 	"k8s.io/apiserver/pkg/util/flushwriter"
 	"k8s.io/component-base/configz"
@@ -565,7 +566,7 @@ func (s *Server) InstallDebuggingHandlers() {
 
 	if utilfeature.DefaultFeatureGate.Enabled(zpagesfeatures.ComponentStatusz) {
 		s.addMetricsBucketMatcher("statusz")
-		statusz.Install(s.restfulCont, ComponentKubelet, statusz.NewRegistry())
+		statusz.Install(s.restfulCont, ComponentKubelet, statusz.NewRegistry(compatibility.DefaultBuildEffectiveVersion()))
 	}
 
 	// The /runningpods endpoint is used for testing only.

staging/src/k8s.io/apiextensions-apiserver/pkg/cmd/server/server.go

@@ -24,7 +24,6 @@ import (
 
 	"k8s.io/apiextensions-apiserver/pkg/cmd/server/options"
 	genericapiserver "k8s.io/apiserver/pkg/server"
-	"k8s.io/component-base/featuregate"
 )
 
 func NewServerCommand(ctx context.Context, out, errOut io.Writer) *cobra.Command {
@@ -34,7 +33,7 @@ func NewServerCommand(ctx context.Context, out, errOut io.Writer) *cobra.Command
 		Short: "Launch an API extensions API server",
 		Long:  "Launch an API extensions API server",
 		PersistentPreRunE: func(*cobra.Command, []string) error {
-			return featuregate.DefaultComponentGlobalsRegistry.Set()
+			return o.ServerRunOptions.ComponentGlobalsRegistry.Set()
 		},
 		RunE: func(c *cobra.Command, args []string) error {
 			if err := o.Complete(); err != nil {

staging/src/k8s.io/apiextensions-apiserver/pkg/cmd/server/testing/testserver.go

@@ -31,18 +31,18 @@ import (
 	extensionsapiserver "k8s.io/apiextensions-apiserver/pkg/apiserver"
 	"k8s.io/apiextensions-apiserver/pkg/cmd/server/options"
 	generatedopenapi "k8s.io/apiextensions-apiserver/pkg/generated/openapi"
-	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
 	"k8s.io/apimachinery/pkg/util/wait"
 	openapinamer "k8s.io/apiserver/pkg/endpoints/openapi"
 	genericapiserver "k8s.io/apiserver/pkg/server"
 	"k8s.io/apiserver/pkg/storage/storagebackend"
+	"k8s.io/apiserver/pkg/util/compatibility"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
 	"k8s.io/apiserver/pkg/util/openapi"
 	"k8s.io/client-go/kubernetes"
 	restclient "k8s.io/client-go/rest"
-	"k8s.io/component-base/featuregate"
+	basecompatibility "k8s.io/component-base/compatibility"
+	featuregatetesting "k8s.io/component-base/featuregate/testing"
 	logsapi "k8s.io/component-base/logs/api/v1"
-	utilversion "k8s.io/component-base/version"
 	"k8s.io/klog/v2"
 )
 
@@ -124,15 +124,17 @@ func StartTestServer(t Logger, _ *TestServerInstanceOptions, customFlags []strin
 
 	fs := pflag.NewFlagSet("test", pflag.PanicOnError)
 
-	featureGate := utilfeature.DefaultMutableFeatureGate
-
-	// Configure the effective version.
-	effectiveVersion := utilversion.DefaultKubeEffectiveVersion()
-	effectiveVersion.SetEmulationVersion(featureGate.EmulationVersion())
-
-	featuregate.DefaultComponentGlobalsRegistry.Reset()
-	utilruntime.Must(featuregate.DefaultComponentGlobalsRegistry.Register(featuregate.DefaultKubeComponent, effectiveVersion, featureGate))
 	s := options.NewCustomResourceDefinitionsServerOptions(os.Stdout, os.Stderr)
+
+	// set up new instance of ComponentGlobalsRegistry instead of using the DefaultComponentGlobalsRegistry to avoid contention in parallel tests.
+	featureGate := utilfeature.DefaultMutableFeatureGate.DeepCopy()
+	effectiveVersion := compatibility.DefaultKubeEffectiveVersionForTest()
+	effectiveVersion.SetEmulationVersion(featureGate.EmulationVersion())
+	componentGlobalsRegistry := basecompatibility.NewComponentGlobalsRegistry()
+	if err := componentGlobalsRegistry.Register(basecompatibility.DefaultKubeComponent, effectiveVersion, featureGate); err != nil {
+		return result, err
+	}
+	s.ServerRunOptions.ComponentGlobalsRegistry = componentGlobalsRegistry
 	s.AddFlags(fs)
 
 	s.RecommendedOptions.SecureServing.Listener, s.RecommendedOptions.SecureServing.BindPort, err = createLocalhostListenerOnFreePort()
@@ -155,8 +157,18 @@ func StartTestServer(t Logger, _ *TestServerInstanceOptions, customFlags []strin
 
 	fs.Parse(customFlags)
 
-	if err := featuregate.DefaultComponentGlobalsRegistry.Set(); err != nil {
+	if err := componentGlobalsRegistry.Set(); err != nil {
-		return result, err
+		return result, fmt.Errorf("%w\nIf you are using SetFeatureGate*DuringTest, try using --emulated-version and --feature-gates flags instead", err)
+	}
+	// If the local ComponentGlobalsRegistry is changed by the flags,
+	// we need to copy the new feature values back to the DefaultFeatureGate because most feature checks still use the DefaultFeatureGate.
+	if !featureGate.EmulationVersion().EqualTo(utilfeature.DefaultMutableFeatureGate.EmulationVersion()) {
+		featuregatetesting.SetFeatureGateEmulationVersionDuringTest(t.(featuregatetesting.TB), utilfeature.DefaultMutableFeatureGate, effectiveVersion.EmulationVersion())
+	}
+	for f := range utilfeature.DefaultMutableFeatureGate.GetAll() {
+		if featureGate.Enabled(f) != utilfeature.DefaultFeatureGate.Enabled(f) {
+			featuregatetesting.SetFeatureGateDuringTest(t.(featuregatetesting.TB), utilfeature.DefaultFeatureGate, f, featureGate.Enabled(f))
+		}
 	}
 
 	if err := s.Complete(); err != nil {

staging/src/k8s.io/apiextensions-apiserver/test/integration/fieldselector_test.go

@@ -41,7 +41,6 @@ import (
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 	"k8s.io/apimachinery/pkg/util/sets"
-	"k8s.io/apimachinery/pkg/util/version"
 	"k8s.io/apimachinery/pkg/util/wait"
 	"k8s.io/apimachinery/pkg/watch"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
@@ -593,9 +592,7 @@ func TestFieldSelectorOpenAPI(t *testing.T) {
 
 func TestFieldSelectorDropFields(t *testing.T) {
 	_, ctx := ktesting.NewTestContext(t)
-	featuregatetesting.SetFeatureGateEmulationVersionDuringTest(t, utilfeature.DefaultFeatureGate, version.MustParse("1.31"))
+	tearDown, apiExtensionClient, _, err := fixtures.StartDefaultServerWithClients(t, "--emulated-version=1.31", "--feature-gates=CustomResourceFieldSelectors=false")
-	featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, apiextensionsfeatures.CustomResourceFieldSelectors, false)
-	tearDown, apiExtensionClient, _, err := fixtures.StartDefaultServerWithClients(t)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -675,9 +672,8 @@ func TestFieldSelectorDropFields(t *testing.T) {
 }
 
 func TestFieldSelectorDisablement(t *testing.T) {
-	featuregatetesting.SetFeatureGateEmulationVersionDuringTest(t, utilfeature.DefaultFeatureGate, version.MustParse("1.31"))
 	_, ctx := ktesting.NewTestContext(t)
-	tearDown, config, _, err := fixtures.StartDefaultServer(t)
+	tearDown, config, _, err := fixtures.StartDefaultServer(t, "--emulated-version=1.31")
 	if err != nil {
 		t.Fatal(err)
 	}

staging/src/k8s.io/apiserver/pkg/authentication/request/x509/x509_test.go

@@ -34,7 +34,6 @@ import (
 	"github.com/stretchr/testify/assert"
 	asn1util "k8s.io/apimachinery/pkg/apis/asn1"
 	"k8s.io/apimachinery/pkg/util/sets"
-	"k8s.io/apimachinery/pkg/util/version"
 	"k8s.io/apiserver/pkg/authentication/authenticator"
 	"k8s.io/apiserver/pkg/authentication/user"
 	"k8s.io/apiserver/pkg/features"
@@ -799,9 +798,6 @@ func TestX509(t *testing.T) {
 			ExpectErr: false,
 			setupFunc: func(t *testing.T) {
 				t.Helper()
-				// This statement can be removed once utilversion.DefaultKubeEffectiveVersion() is >= 1.33
-				featuregatetesting.SetFeatureGateEmulationVersionDuringTest(t, feature.DefaultFeatureGate, version.MustParse("1.33"))
-
 			},
 		},
 		"common name and empty UID with feature gate disabled": {
@@ -822,8 +818,6 @@ func TestX509(t *testing.T) {
 			ExpectErr: false,
 			setupFunc: func(t *testing.T) {
 				t.Helper()
-				// This statement can be removed once utilversion.DefaultKubeEffectiveVersion() is >= 1.33
-				featuregatetesting.SetFeatureGateEmulationVersionDuringTest(t, feature.DefaultFeatureGate, version.MustParse("1.33"))
 				featuregatetesting.SetFeatureGateDuringTest(t, feature.DefaultFeatureGate, features.AllowParsingUserUIDFromCertAuth, false)
 			},
 		},
@@ -836,9 +830,6 @@ func TestX509(t *testing.T) {
 			ExpectErrMsg: regexp.MustCompile("UID cannot be an empty string"),
 			setupFunc: func(t *testing.T) {
 				t.Helper()
-				// This statement can be removed once utilversion.DefaultKubeEffectiveVersion() is >= 1.33
-				featuregatetesting.SetFeatureGateEmulationVersionDuringTest(t, feature.DefaultFeatureGate, version.MustParse("1.33"))
-
 			},
 		},
 		"ca with non-string UID": {
@@ -850,9 +841,6 @@ func TestX509(t *testing.T) {
 			ExpectErrMsg: regexp.MustCompile("unable to parse UID into a string"),
 			setupFunc: func(t *testing.T) {
 				t.Helper()
-				// This statement can be removed once utilversion.DefaultKubeEffectiveVersion() is >= 1.33
-				featuregatetesting.SetFeatureGateEmulationVersionDuringTest(t, feature.DefaultFeatureGate, version.MustParse("1.33"))
-
 			},
 		},
 		"ca with multiple UIDs": {
@@ -866,9 +854,6 @@ func TestX509(t *testing.T) {
 			ExpectErrMsg: regexp.MustCompile("expected 1 UID, but found multiple"),
 			setupFunc: func(t *testing.T) {
 				t.Helper()
-				// This statement can be removed once utilversion.DefaultKubeEffectiveVersion() is >= 1.33
-				featuregatetesting.SetFeatureGateEmulationVersionDuringTest(t, feature.DefaultFeatureGate, version.MustParse("1.33"))
-
 			},
 		},
 		"ca with multiple organizations": {

staging/src/k8s.io/apiserver/pkg/cel/environment/base.go

@@ -32,9 +32,9 @@ import (
 	celconfig "k8s.io/apiserver/pkg/apis/cel"
 	"k8s.io/apiserver/pkg/cel/library"
 	genericfeatures "k8s.io/apiserver/pkg/features"
+	"k8s.io/apiserver/pkg/util/compatibility"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
-	"k8s.io/component-base/featuregate"
+	basecompatibility "k8s.io/component-base/compatibility"
-	utilversion "k8s.io/component-base/version"
 )
 
 // DefaultCompatibilityVersion returns a default compatibility version for use with EnvSet
@@ -50,9 +50,9 @@ import (
 // A default version number equal to the current Kubernetes major.minor version
 // indicates fast forward CEL features that can be used when rollback is no longer needed.
 func DefaultCompatibilityVersion() *version.Version {
-	effectiveVer := featuregate.DefaultComponentGlobalsRegistry.EffectiveVersionFor(featuregate.DefaultKubeComponent)
+	effectiveVer := compatibility.DefaultComponentGlobalsRegistry.EffectiveVersionFor(basecompatibility.DefaultKubeComponent)
 	if effectiveVer == nil {
-		effectiveVer = utilversion.DefaultKubeEffectiveVersion()
+		effectiveVer = compatibility.DefaultBuildEffectiveVersion()
 	}
 	return effectiveVer.MinCompatibilityVersion()
 }

staging/src/k8s.io/apiserver/pkg/server/config.go

@@ -73,12 +73,12 @@ import (
 	flowcontrolrequest "k8s.io/apiserver/pkg/util/flowcontrol/request"
 	"k8s.io/client-go/informers"
 	restclient "k8s.io/client-go/rest"
+	basecompatibility "k8s.io/component-base/compatibility"
 	"k8s.io/component-base/featuregate"
 	"k8s.io/component-base/logs"
 	"k8s.io/component-base/metrics/features"
 	"k8s.io/component-base/metrics/prometheus/slis"
 	"k8s.io/component-base/tracing"
-	utilversion "k8s.io/component-base/version"
 	"k8s.io/component-base/zpages/flagz"
 	"k8s.io/klog/v2"
 	openapicommon "k8s.io/kube-openapi/pkg/common"
@@ -153,7 +153,7 @@ type Config struct {
 
 	// EffectiveVersion determines which apis and features are available
 	// based on when the api/feature lifecyle.
-	EffectiveVersion utilversion.EffectiveVersion
+	EffectiveVersion basecompatibility.EffectiveVersion
 	// FeatureGate is a way to plumb feature gate through if you have them.
 	FeatureGate featuregate.FeatureGate
 	// AuditBackend is where audit events are sent to.

staging/src/k8s.io/apiserver/pkg/server/config_test.go

@@ -47,9 +47,9 @@ import (
 	"k8s.io/client-go/informers"
 	"k8s.io/client-go/kubernetes/fake"
 	"k8s.io/client-go/rest"
+	basecompatibility "k8s.io/component-base/compatibility"
 	featuregatetesting "k8s.io/component-base/featuregate/testing"
 	"k8s.io/component-base/tracing"
-	utilversion "k8s.io/component-base/version"
 	"k8s.io/klog/v2/ktesting"
 	netutils "k8s.io/utils/net"
 )
@@ -124,7 +124,7 @@ func TestNewWithDelegate(t *testing.T) {
 	delegateConfig.PublicAddress = netutils.ParseIPSloppy("192.168.10.4")
 	delegateConfig.LegacyAPIGroupPrefixes = sets.NewString("/api")
 	delegateConfig.LoopbackClientConfig = &rest.Config{}
-	delegateConfig.EffectiveVersion = utilversion.NewEffectiveVersion("")
+	delegateConfig.EffectiveVersion = basecompatibility.NewEffectiveVersionFromString("", "", "")
 	clientset := fake.NewSimpleClientset()
 	if clientset == nil {
 		t.Fatal("unable to create fake client set")
@@ -157,7 +157,7 @@ func TestNewWithDelegate(t *testing.T) {
 	wrappingConfig.PublicAddress = netutils.ParseIPSloppy("192.168.10.4")
 	wrappingConfig.LegacyAPIGroupPrefixes = sets.NewString("/api")
 	wrappingConfig.LoopbackClientConfig = &rest.Config{}
-	wrappingConfig.EffectiveVersion = utilversion.NewEffectiveVersion("")
+	wrappingConfig.EffectiveVersion = basecompatibility.NewEffectiveVersionFromString("", "", "")
 
 	wrappingConfig.HealthzChecks = append(wrappingConfig.HealthzChecks, healthz.NamedCheck("wrapping-health", func(r *http.Request) error {
 		return fmt.Errorf("wrapping failed healthcheck")
@@ -434,7 +434,7 @@ func TestNewFeatureGatedSerializer(t *testing.T) {
 		}
 	})))
 	config.ExternalAddress = "192.168.10.4:443"
-	config.EffectiveVersion = utilversion.NewEffectiveVersion("")
+	config.EffectiveVersion = basecompatibility.NewEffectiveVersionFromString("", "", "")
 	config.LoopbackClientConfig = &rest.Config{}
 
 	if _, err := config.Complete(nil).New("test", NewEmptyDelegate()); err != nil {

staging/src/k8s.io/apiserver/pkg/server/genericapiserver.go

@@ -54,8 +54,8 @@ import (
 	"k8s.io/apiserver/pkg/storageversion"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
 	restclient "k8s.io/client-go/rest"
+	basecompatibility "k8s.io/component-base/compatibility"
 	"k8s.io/component-base/featuregate"
-	utilversion "k8s.io/component-base/version"
 	"k8s.io/klog/v2"
 	openapibuilder3 "k8s.io/kube-openapi/pkg/builder3"
 	openapicommon "k8s.io/kube-openapi/pkg/common"
@@ -244,7 +244,7 @@ type GenericAPIServer struct {
 
 	// EffectiveVersion determines which apis and features are available
 	// based on when the api/feature lifecyle.
-	EffectiveVersion utilversion.EffectiveVersion
+	EffectiveVersion basecompatibility.EffectiveVersion
 	// FeatureGate is a way to plumb feature gate through if you have them.
 	FeatureGate featuregate.FeatureGate
 

staging/src/k8s.io/apiserver/pkg/server/genericapiserver_test.go

@@ -38,6 +38,7 @@ import (
 	"k8s.io/apimachinery/pkg/runtime/serializer"
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
 	"k8s.io/apimachinery/pkg/util/sets"
+	utilversion "k8s.io/apimachinery/pkg/util/version"
 	"k8s.io/apimachinery/pkg/util/wait"
 	"k8s.io/apimachinery/pkg/version"
 	"k8s.io/apiserver/pkg/apis/example"
@@ -52,7 +53,7 @@ import (
 	"k8s.io/client-go/informers"
 	"k8s.io/client-go/kubernetes/fake"
 	restclient "k8s.io/client-go/rest"
-	utilversion "k8s.io/component-base/version"
+	basecompatibility "k8s.io/component-base/compatibility"
 	"k8s.io/klog/v2/ktesting"
 	kubeopenapi "k8s.io/kube-openapi/pkg/common"
 	"k8s.io/kube-openapi/pkg/validation/spec"
@@ -138,7 +139,7 @@ func setUp(t *testing.T) (Config, *assert.Assertions) {
 	if clientset == nil {
 		t.Fatal("unable to create fake client set")
 	}
-	config.EffectiveVersion = utilversion.NewEffectiveVersion("")
+	config.EffectiveVersion = basecompatibility.NewEffectiveVersionFromString("", "", "")
 	config.OpenAPIConfig = DefaultOpenAPIConfig(testGetOpenAPIDefinitions, openapinamer.NewDefinitionNamer(runtime.NewScheme()))
 	config.OpenAPIConfig.Info.Version = "unversioned"
 	config.OpenAPIV3Config = DefaultOpenAPIV3Config(testGetOpenAPIDefinitions, openapinamer.NewDefinitionNamer(runtime.NewScheme()))
@@ -460,8 +461,8 @@ func TestNotRestRoutesHaveAuth(t *testing.T) {
 	config.EnableProfiling = true
 
 	kubeVersion := fakeVersion()
-	effectiveVersion := utilversion.NewEffectiveVersion(kubeVersion.String())
+	binaryVersion := utilversion.MustParse(kubeVersion.String())
-	effectiveVersion.Set(effectiveVersion.BinaryVersion().WithInfo(kubeVersion), effectiveVersion.EmulationVersion(), effectiveVersion.MinCompatibilityVersion())
+	effectiveVersion := basecompatibility.NewEffectiveVersion(binaryVersion, false, binaryVersion, binaryVersion.SubtractMinor(1))
 	config.EffectiveVersion = effectiveVersion
 
 	s, err := config.Complete(nil).New("test", NewEmptyDelegate())

staging/src/k8s.io/apiserver/pkg/server/options/server_run_options.go

@@ -27,9 +27,9 @@ import (
 	"k8s.io/apimachinery/pkg/util/errors"
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
 	"k8s.io/apiserver/pkg/server"
+	"k8s.io/apiserver/pkg/util/compatibility"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
-	"k8s.io/component-base/featuregate"
+	basecompatibility "k8s.io/component-base/compatibility"
-	utilversion "k8s.io/component-base/version"
 
 	"github.com/spf13/pflag"
 )
@@ -95,22 +95,22 @@ type ServerRunOptions struct {
 	ShutdownWatchTerminationGracePeriod time.Duration
 
 	// ComponentGlobalsRegistry is the registry where the effective versions and feature gates for all components are stored.
-	ComponentGlobalsRegistry featuregate.ComponentGlobalsRegistry
+	ComponentGlobalsRegistry basecompatibility.ComponentGlobalsRegistry
 	// ComponentName is name under which the server's global variabled are registered in the ComponentGlobalsRegistry.
 	ComponentName string
 }
 
 func NewServerRunOptions() *ServerRunOptions {
-	if featuregate.DefaultComponentGlobalsRegistry.EffectiveVersionFor(featuregate.DefaultKubeComponent) == nil {
+	if compatibility.DefaultComponentGlobalsRegistry.EffectiveVersionFor(basecompatibility.DefaultKubeComponent) == nil {
 		featureGate := utilfeature.DefaultMutableFeatureGate
-		effectiveVersion := utilversion.DefaultKubeEffectiveVersion()
+		effectiveVersion := compatibility.DefaultBuildEffectiveVersion()
-		utilruntime.Must(featuregate.DefaultComponentGlobalsRegistry.Register(featuregate.DefaultKubeComponent, effectiveVersion, featureGate))
+		utilruntime.Must(compatibility.DefaultComponentGlobalsRegistry.Register(basecompatibility.DefaultKubeComponent, effectiveVersion, featureGate))
 	}
 
-	return NewServerRunOptionsForComponent(featuregate.DefaultKubeComponent, featuregate.DefaultComponentGlobalsRegistry)
+	return NewServerRunOptionsForComponent(basecompatibility.DefaultKubeComponent, compatibility.DefaultComponentGlobalsRegistry)
 }
 
-func NewServerRunOptionsForComponent(componentName string, componentGlobalsRegistry featuregate.ComponentGlobalsRegistry) *ServerRunOptions {
+func NewServerRunOptionsForComponent(componentName string, componentGlobalsRegistry basecompatibility.ComponentGlobalsRegistry) *ServerRunOptions {
 	defaults := server.NewConfig(serializer.CodecFactory{})
 	return &ServerRunOptions{
 		MaxRequestsInFlight:                 defaults.MaxRequestsInFlight,

staging/src/k8s.io/apiserver/pkg/server/options/server_run_options_test.go

@@ -26,15 +26,15 @@ import (
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
 	"k8s.io/apimachinery/pkg/util/version"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
-	"k8s.io/component-base/featuregate"
+	basecompatibility "k8s.io/component-base/compatibility"
-	utilversion "k8s.io/component-base/version"
 	netutils "k8s.io/utils/net"
 )
 
 func TestServerRunOptionsValidate(t *testing.T) {
-	testRegistry := featuregate.NewComponentGlobalsRegistry()
+	defaultComponentGlobalsRegistry := basecompatibility.NewComponentGlobalsRegistry()
+	testRegistry := basecompatibility.NewComponentGlobalsRegistry()
 	featureGate := utilfeature.DefaultFeatureGate.DeepCopy()
-	effectiveVersion := utilversion.NewEffectiveVersion("1.35")
+	effectiveVersion := basecompatibility.NewEffectiveVersionFromString("1.35", "1.32", "1.32")
 	effectiveVersion.SetEmulationVersion(version.MajorMinor(1, 31))
 	testComponent := "test"
 	utilruntime.Must(testRegistry.Register(testComponent, effectiveVersion, featureGate))
@@ -55,7 +55,7 @@ func TestServerRunOptionsValidate(t *testing.T) {
 				MinRequestTimeout:           1800,
 				JSONPatchMaxCopyBytes:       10 * 1024 * 1024,
 				MaxRequestBodyBytes:         10 * 1024 * 1024,
-				ComponentGlobalsRegistry:    featuregate.DefaultComponentGlobalsRegistry,
+				ComponentGlobalsRegistry:    defaultComponentGlobalsRegistry,
 			},
 			expectErr: "--max-requests-inflight can not be negative value",
 		},
@@ -70,7 +70,7 @@ func TestServerRunOptionsValidate(t *testing.T) {
 				MinRequestTimeout:           1800,
 				JSONPatchMaxCopyBytes:       10 * 1024 * 1024,
 				MaxRequestBodyBytes:         10 * 1024 * 1024,
-				ComponentGlobalsRegistry:    featuregate.DefaultComponentGlobalsRegistry,
+				ComponentGlobalsRegistry:    defaultComponentGlobalsRegistry,
 			},
 			expectErr: "--max-mutating-requests-inflight can not be negative value",
 		},
@@ -85,7 +85,7 @@ func TestServerRunOptionsValidate(t *testing.T) {
 				MinRequestTimeout:           1800,
 				JSONPatchMaxCopyBytes:       10 * 1024 * 1024,
 				MaxRequestBodyBytes:         10 * 1024 * 1024,
-				ComponentGlobalsRegistry:    featuregate.DefaultComponentGlobalsRegistry,
+				ComponentGlobalsRegistry:    defaultComponentGlobalsRegistry,
 			},
 			expectErr: "--request-timeout can not be negative value",
 		},
@@ -100,7 +100,7 @@ func TestServerRunOptionsValidate(t *testing.T) {
 				MinRequestTimeout:           -1800,
 				JSONPatchMaxCopyBytes:       10 * 1024 * 1024,
 				MaxRequestBodyBytes:         10 * 1024 * 1024,
-				ComponentGlobalsRegistry:    featuregate.DefaultComponentGlobalsRegistry,
+				ComponentGlobalsRegistry:    defaultComponentGlobalsRegistry,
 			},
 			expectErr: "--min-request-timeout can not be negative value",
 		},
@@ -115,7 +115,7 @@ func TestServerRunOptionsValidate(t *testing.T) {
 				MinRequestTimeout:           1800,
 				JSONPatchMaxCopyBytes:       -10 * 1024 * 1024,
 				MaxRequestBodyBytes:         10 * 1024 * 1024,
-				ComponentGlobalsRegistry:    featuregate.DefaultComponentGlobalsRegistry,
+				ComponentGlobalsRegistry:    defaultComponentGlobalsRegistry,
 			},
 			expectErr: "ServerRunOptions.JSONPatchMaxCopyBytes can not be negative value",
 		},
@@ -130,7 +130,7 @@ func TestServerRunOptionsValidate(t *testing.T) {
 				MinRequestTimeout:           1800,
 				JSONPatchMaxCopyBytes:       10 * 1024 * 1024,
 				MaxRequestBodyBytes:         -10 * 1024 * 1024,
-				ComponentGlobalsRegistry:    featuregate.DefaultComponentGlobalsRegistry,
+				ComponentGlobalsRegistry:    defaultComponentGlobalsRegistry,
 			},
 			expectErr: "ServerRunOptions.MaxRequestBodyBytes can not be negative value",
 		},
@@ -146,7 +146,7 @@ func TestServerRunOptionsValidate(t *testing.T) {
 				JSONPatchMaxCopyBytes:       10 * 1024 * 1024,
 				MaxRequestBodyBytes:         10 * 1024 * 1024,
 				LivezGracePeriod:            -time.Second,
-				ComponentGlobalsRegistry:    featuregate.DefaultComponentGlobalsRegistry,
+				ComponentGlobalsRegistry:    defaultComponentGlobalsRegistry,
 			},
 			expectErr: "--livez-grace-period can not be a negative value",
 		},
@@ -162,7 +162,7 @@ func TestServerRunOptionsValidate(t *testing.T) {
 				JSONPatchMaxCopyBytes:       10 * 1024 * 1024,
 				MaxRequestBodyBytes:         10 * 1024 * 1024,
 				ShutdownDelayDuration:       -time.Second,
-				ComponentGlobalsRegistry:    featuregate.DefaultComponentGlobalsRegistry,
+				ComponentGlobalsRegistry:    defaultComponentGlobalsRegistry,
 			},
 			expectErr: "--shutdown-delay-duration can not be negative value",
 		},
@@ -178,7 +178,7 @@ func TestServerRunOptionsValidate(t *testing.T) {
 				MinRequestTimeout:           1800,
 				JSONPatchMaxCopyBytes:       10 * 1024 * 1024,
 				MaxRequestBodyBytes:         10 * 1024 * 1024,
-				ComponentGlobalsRegistry:    featuregate.DefaultComponentGlobalsRegistry,
+				ComponentGlobalsRegistry:    defaultComponentGlobalsRegistry,
 			},
 			expectErr: "--strict-transport-security-directives invalid, allowed values: max-age=expireTime, includeSubDomains, preload. see https://tools.ietf.org/html/rfc6797#section-6.1 for more information",
 		},
@@ -211,7 +211,7 @@ func TestServerRunOptionsValidate(t *testing.T) {
 				MinRequestTimeout:           1800,
 				JSONPatchMaxCopyBytes:       10 * 1024 * 1024,
 				MaxRequestBodyBytes:         10 * 1024 * 1024,
-				ComponentGlobalsRegistry:    featuregate.DefaultComponentGlobalsRegistry,
+				ComponentGlobalsRegistry:    defaultComponentGlobalsRegistry,
 			},
 		},
 	}

staging/src/k8s.io/apiserver/pkg/server/options/serving_test.go

@@ -46,7 +46,7 @@ import (
 	"k8s.io/client-go/discovery"
 	restclient "k8s.io/client-go/rest"
 	cliflag "k8s.io/component-base/cli/flag"
-	utilversion "k8s.io/component-base/version"
+	basecompatibility "k8s.io/component-base/compatibility"
 	"k8s.io/klog/v2/ktesting"
 	netutils "k8s.io/utils/net"
 )
@@ -278,7 +278,7 @@ func TestServerRunWithSNI(t *testing.T) {
 			// launch server
 			config := setUp(t)
 			v := fakeVersion()
-			config.EffectiveVersion = utilversion.NewEffectiveVersion(v.String())
+			config.EffectiveVersion = basecompatibility.NewEffectiveVersionFromString(v.String(), "", "")
 
 			config.EnableIndex = true
 			secureOptions := (&SecureServingOptions{

staging/src/k8s.io/apiserver/pkg/server/storage/resource_encoding_config.go

@@ -22,7 +22,8 @@ import (
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 	apimachineryversion "k8s.io/apimachinery/pkg/util/version"
-	version "k8s.io/component-base/version"
+	"k8s.io/apiserver/pkg/util/compatibility"
+	basecompatibility "k8s.io/component-base/compatibility"
 )
 
 type ResourceEncodingConfig interface {
@@ -43,7 +44,7 @@ type DefaultResourceEncodingConfig struct {
 	// resources records the overriding encoding configs for individual resources.
 	resources        map[schema.GroupResource]*OverridingResourceEncoding
 	scheme           *runtime.Scheme
-	effectiveVersion version.EffectiveVersion
+	effectiveVersion basecompatibility.EffectiveVersion
 }
 
 type OverridingResourceEncoding struct {
@@ -54,7 +55,11 @@ type OverridingResourceEncoding struct {
 var _ ResourceEncodingConfig = &DefaultResourceEncodingConfig{}
 
 func NewDefaultResourceEncodingConfig(scheme *runtime.Scheme) *DefaultResourceEncodingConfig {
-	return &DefaultResourceEncodingConfig{resources: map[schema.GroupResource]*OverridingResourceEncoding{}, scheme: scheme, effectiveVersion: version.DefaultKubeEffectiveVersion()}
+	return NewDefaultResourceEncodingConfigForEffectiveVersion(scheme, compatibility.DefaultComponentGlobalsRegistry.EffectiveVersionFor(basecompatibility.DefaultKubeComponent))
+}
+
+func NewDefaultResourceEncodingConfigForEffectiveVersion(scheme *runtime.Scheme, effectiveVersion basecompatibility.EffectiveVersion) *DefaultResourceEncodingConfig {
+	return &DefaultResourceEncodingConfig{resources: map[schema.GroupResource]*OverridingResourceEncoding{}, scheme: scheme, effectiveVersion: effectiveVersion}
 }
 
 func (o *DefaultResourceEncodingConfig) SetResourceEncoding(resourceBeingStored schema.GroupResource, externalEncodingVersion, internalVersion schema.GroupVersion) {
@@ -64,7 +69,7 @@ func (o *DefaultResourceEncodingConfig) SetResourceEncoding(resourceBeingStored
 	}
 }
 
-func (o *DefaultResourceEncodingConfig) SetEffectiveVersion(effectiveVersion version.EffectiveVersion) {
+func (o *DefaultResourceEncodingConfig) SetEffectiveVersion(effectiveVersion basecompatibility.EffectiveVersion) {
 	o.effectiveVersion = effectiveVersion
 }
 
@@ -121,7 +126,7 @@ type replacementInterface interface {
 	APILifecycleReplacement() schema.GroupVersionKind
 }
 
-func emulatedStorageVersion(binaryVersionOfResource schema.GroupVersion, example runtime.Object, effectiveVersion version.EffectiveVersion, scheme *runtime.Scheme) (schema.GroupVersion, error) {
+func emulatedStorageVersion(binaryVersionOfResource schema.GroupVersion, example runtime.Object, effectiveVersion basecompatibility.EffectiveVersion, scheme *runtime.Scheme) (schema.GroupVersion, error) {
 	if example == nil || effectiveVersion == nil {
 		return binaryVersionOfResource, nil
 	}
@@ -172,7 +177,7 @@ func emulatedStorageVersion(binaryVersionOfResource schema.GroupVersion, example
 		}
 
 		// If it was introduced after current compatibility version, don't use it
-		// skip the introduced check for test when currentVersion is 0.0 to test all apis
+		// skip the introduced check for test when current compatibility version is 0.0 to test all apis
 		if introduced, hasIntroduced := exampleOfGVK.(introducedInterface); hasIntroduced && (compatibilityVersion.Major() > 0 || compatibilityVersion.Minor() > 0) {
 
 			// Skip versions that have a replacement.

staging/src/k8s.io/apiserver/pkg/server/storage/resource_encoding_config_test.go

@@ -25,7 +25,7 @@ import (
 	"k8s.io/apimachinery/pkg/test"
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
 	utilversion "k8s.io/apimachinery/pkg/util/version"
-	"k8s.io/component-base/version"
+	basecompatibility "k8s.io/component-base/compatibility"
 )
 
 func TestEmulatedStorageVersion(t *testing.T) {
@@ -33,21 +33,21 @@ func TestEmulatedStorageVersion(t *testing.T) {
 		name             string
 		scheme           *runtime.Scheme
 		binaryVersion    schema.GroupVersion
-		effectiveVersion version.EffectiveVersion
+		effectiveVersion basecompatibility.EffectiveVersion
 		want             schema.GroupVersion
 	}{
 		{
 			name:             "pick compatible",
 			scheme:           AlphaBetaScheme(utilversion.MustParse("1.31"), utilversion.MustParse("1.32")),
 			binaryVersion:    v1beta1,
-			effectiveVersion: version.NewEffectiveVersion("1.32"),
+			effectiveVersion: basecompatibility.NewEffectiveVersionFromString("1.32", "", ""),
 			want:             v1alpha1,
 		},
 		{
 			name:             "alpha has been replaced, pick binary version",
 			scheme:           AlphaReplacedBetaScheme(utilversion.MustParse("1.31"), utilversion.MustParse("1.32")),
 			binaryVersion:    v1beta1,
-			effectiveVersion: version.NewEffectiveVersion("1.32"),
+			effectiveVersion: basecompatibility.NewEffectiveVersionFromString("1.32", "", ""),
 			want:             v1beta1,
 		},
 	}

staging/src/k8s.io/apiserver/pkg/server/storage/storage_factory_test.go

@@ -33,7 +33,7 @@ import (
 	"k8s.io/apiserver/pkg/apis/example2"
 	example2install "k8s.io/apiserver/pkg/apis/example2/install"
 	"k8s.io/apiserver/pkg/storage/storagebackend"
-	version "k8s.io/component-base/version"
+	basecompatibility "k8s.io/component-base/compatibility"
 )
 
 var (
@@ -569,8 +569,7 @@ func TestStorageFactoryCompatibilityVersion(t *testing.T) {
 
 		gvk := gvks[0]
 		t.Run(gvk.GroupKind().String()+"@"+tc.effectiveVersion, func(t *testing.T) {
-			config := NewDefaultResourceEncodingConfig(sch)
+			config := NewDefaultResourceEncodingConfigForEffectiveVersion(sch, basecompatibility.NewEffectiveVersionFromString(tc.effectiveVersion, "", ""))
-			config.SetEffectiveVersion(version.NewEffectiveVersion(tc.effectiveVersion))
 			f := NewDefaultStorageFactory(
 				storagebackend.Config{},
 				"",

staging/src/k8s.io/apiserver/pkg/util/compatibility/registry.go

@@ -0,0 +1,53 @@
+/*
+Copyright 2025 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package compatibility
+
+import (
+	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
+	utilfeature "k8s.io/apiserver/pkg/util/feature"
+	basecompatibility "k8s.io/component-base/compatibility"
+)
+
+// DefaultComponentGlobalsRegistry is the global var to store the effective versions and feature gates for all components for easy access.
+// Example usage:
+// // register the component effective version and feature gate first
+// wardleEffectiveVersion := basecompatibility.NewEffectiveVersion("1.2")
+// wardleFeatureGate := featuregate.NewFeatureGate()
+// utilruntime.Must(compatibility.DefaultComponentGlobalsRegistry.Register(apiserver.WardleComponentName, wardleEffectiveVersion, wardleFeatureGate, false))
+//
+//	cmd := &cobra.Command{
+//	 ...
+//		// call DefaultComponentGlobalsRegistry.Set() in PersistentPreRunE to ensure the feature gates are set based on emulation version right after parsing the flags.
+//		PersistentPreRunE: func(*cobra.Command, []string) error {
+//			if err := compatibility.DefaultComponentGlobalsRegistry.Set(); err != nil {
+//				return err
+//			}
+//	 ...
+//		},
+//		RunE: func(c *cobra.Command, args []string) error {
+//			// call compatibility.DefaultComponentGlobalsRegistry.Validate() somewhere
+//		},
+//	}
+//
+// flags := cmd.Flags()
+// // add flags
+// compatibility.DefaultComponentGlobalsRegistry.AddFlags(flags)
+var DefaultComponentGlobalsRegistry basecompatibility.ComponentGlobalsRegistry = basecompatibility.NewComponentGlobalsRegistry()
+
+func init() {
+	utilruntime.Must(DefaultComponentGlobalsRegistry.Register(basecompatibility.DefaultKubeComponent, DefaultBuildEffectiveVersion(), utilfeature.DefaultMutableFeatureGate))
+}

staging/src/k8s.io/apiserver/pkg/util/compatibility/version.go

@@ -0,0 +1,65 @@
+/*
+Copyright 2025 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package compatibility
+
+import (
+	"k8s.io/apimachinery/pkg/util/version"
+	basecompatibility "k8s.io/component-base/compatibility"
+	baseversion "k8s.io/component-base/version"
+)
+
+// minimumKubeEmulationVersion is the first release emulation version is introduced,
+// so the emulation version cannot go lower than that.
+var minimumKubeEmulationVersion *version.Version = version.MajorMinor(1, 31)
+
+// DefaultBuildEffectiveVersion returns the MutableEffectiveVersion based on the
+// current build information.
+func DefaultBuildEffectiveVersion() basecompatibility.MutableEffectiveVersion {
+	binaryVersion := defaultBuildBinaryVersion()
+	useDefaultBuildBinaryVersion := true
+	// fall back to the hard coded kube version only when the git tag is not available for local unit tests.
+	if binaryVersion.Major() == 0 && binaryVersion.Minor() == 0 {
+		useDefaultBuildBinaryVersion = false
+		binaryVersion = version.MustParse(baseversion.DefaultKubeBinaryVersion)
+	}
+	versionFloor := kubeEffectiveVersionFloors(binaryVersion)
+	return basecompatibility.NewEffectiveVersion(binaryVersion, useDefaultBuildBinaryVersion, versionFloor, versionFloor)
+}
+
+func kubeEffectiveVersionFloors(binaryVersion *version.Version) *version.Version {
+	// both emulationVersion and minCompatibilityVersion can be set to binaryVersion - 3
+	versionFloor := binaryVersion.WithPatch(0).SubtractMinor(3)
+	if versionFloor.LessThan(minimumKubeEmulationVersion) {
+		versionFloor = minimumKubeEmulationVersion
+	}
+	return versionFloor
+}
+
+// DefaultKubeEffectiveVersionForTest returns the MutableEffectiveVersion based on the
+// latest K8s release hardcoded in DefaultKubeBinaryVersion.
+// DefaultKubeBinaryVersion is hard coded because defaultBuildBinaryVersion would return 0.0 when test is run without a git tag.
+// We do not enforce the N-3..N emulation version range in tests so that the tests would not automatically fail when there is a version bump.
+// Only used in tests.
+func DefaultKubeEffectiveVersionForTest() basecompatibility.MutableEffectiveVersion {
+	binaryVersion := version.MustParse(baseversion.DefaultKubeBinaryVersion).WithInfo(baseversion.Get())
+	return basecompatibility.NewEffectiveVersion(binaryVersion, false, version.MustParse("0.0"), version.MustParse("0.0"))
+}
+
+func defaultBuildBinaryVersion() *version.Version {
+	verInfo := baseversion.Get()
+	return version.MustParse(verInfo.String()).WithInfo(verInfo)
+}

staging/src/k8s.io/apiserver/pkg/util/compatibility/version_test.go

@@ -0,0 +1,76 @@
+/*
+Copyright 2025 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package compatibility
+
+import (
+	"testing"
+
+	"k8s.io/apimachinery/pkg/util/version"
+	basecompatibility "k8s.io/component-base/compatibility"
+)
+
+func TestValidateKubeEffectiveVersion(t *testing.T) {
+	tests := []struct {
+		name                    string
+		emulationVersion        string
+		minCompatibilityVersion string
+		expectErr               bool
+	}{
+		{
+			name:                    "valid versions",
+			emulationVersion:        "v1.32.0",
+			minCompatibilityVersion: "v1.31.0",
+			expectErr:               false,
+		},
+		{
+			name:                    "emulationVersion too low",
+			emulationVersion:        "v1.30.0",
+			minCompatibilityVersion: "v1.31.0",
+			expectErr:               true,
+		},
+		{
+			name:                    "minCompatibilityVersion too low",
+			emulationVersion:        "v1.31.0",
+			minCompatibilityVersion: "v1.30.0",
+			expectErr:               true,
+		},
+		{
+			name:                    "both versions too low",
+			emulationVersion:        "v1.30.0",
+			minCompatibilityVersion: "v1.29.0",
+			expectErr:               true,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			binaryVersion := version.MustParseGeneric("1.33")
+			versionFloor := kubeEffectiveVersionFloors(binaryVersion)
+			effective := basecompatibility.NewEffectiveVersion(binaryVersion, false, versionFloor, versionFloor)
+			effective.SetEmulationVersion(version.MustParseGeneric(test.emulationVersion))
+			effective.SetMinCompatibilityVersion(version.MustParseGeneric(test.minCompatibilityVersion))
+
+			err := effective.Validate()
+			if test.expectErr && err == nil {
+				t.Error("expected error, but got nil")
+			}
+			if !test.expectErr && err != nil {
+				t.Errorf("unexpected error: %v", err)
+			}
+		})
+	}
+}

staging/src/k8s.io/component-base/compatibility/OWNERS

@@ -0,0 +1,12 @@
+# See the OWNERS docs at https://go.k8s.io/owners
+
+# Currently assigned this directory to sig-api-machinery since this is
+# an interface to the version definition in "k8s.io/apiserver/pkg/util/compatibility".
+
+approvers:
+  - sig-api-machinery-api-approvers
+reviewers:
+  - sig-api-machinery-api-reviewers
+  - siyuanfoundation
+labels:
+  - sig/api-machinery

staging/src/k8s.io/component-base/compatibility/registry.go

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package featuregate
+package compatibility
 
 import (
 	"fmt"
@@ -26,38 +26,12 @@ import (
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
 	"k8s.io/apimachinery/pkg/util/version"
 	cliflag "k8s.io/component-base/cli/flag"
-	baseversion "k8s.io/component-base/version"
+	"k8s.io/component-base/featuregate"
 	"k8s.io/klog/v2"
 )
 
-// DefaultComponentGlobalsRegistry is the global var to store the effective versions and feature gates for all components for easy access.
-// Example usage:
-// // register the component effective version and feature gate first
-// _, _ = utilversion.DefaultComponentGlobalsRegistry.ComponentGlobalsOrRegister(utilversion.DefaultKubeComponent, utilversion.DefaultKubeEffectiveVersion(), utilfeature.DefaultMutableFeatureGate)
-// wardleEffectiveVersion := utilversion.NewEffectiveVersion("1.2")
-// wardleFeatureGate := featuregate.NewFeatureGate()
-// utilruntime.Must(utilversion.DefaultComponentGlobalsRegistry.Register(apiserver.WardleComponentName, wardleEffectiveVersion, wardleFeatureGate, false))
-//
-//	cmd := &cobra.Command{
-//	 ...
-//		// call DefaultComponentGlobalsRegistry.Set() in PersistentPreRunE
-//		PersistentPreRunE: func(*cobra.Command, []string) error {
-//			if err := utilversion.DefaultComponentGlobalsRegistry.Set(); err != nil {
-//				return err
-//			}
-//	 ...
-//		},
-//		RunE: func(c *cobra.Command, args []string) error {
-//			// call utilversion.DefaultComponentGlobalsRegistry.Validate() somewhere
-//		},
-//	}
-//
-// flags := cmd.Flags()
-// // add flags
-// utilversion.DefaultComponentGlobalsRegistry.AddFlags(flags)
-var DefaultComponentGlobalsRegistry ComponentGlobalsRegistry = NewComponentGlobalsRegistry()
-
 const (
+	// DefaultKubeComponent is the component name for k8s control plane components.
 	DefaultKubeComponent = "kube"
 
 	klogLevel = 2
@@ -65,10 +39,10 @@ const (
 
 type VersionMapping func(from *version.Version) *version.Version
 
-// ComponentGlobals stores the global variables for a component for easy access.
+// ComponentGlobals stores the global variables for a component for easy access, including feature gate and effective version.
 type ComponentGlobals struct {
-	effectiveVersion baseversion.MutableEffectiveVersion
+	effectiveVersion MutableEffectiveVersion
-	featureGate      MutableVersionedFeatureGate
+	featureGate      featuregate.MutableVersionedFeatureGate
 
 	// emulationVersionMapping contains the mapping from the emulation version of this component
 	// to the emulation version of another component.
@@ -84,22 +58,24 @@ type ComponentGlobals struct {
 	dependentMinCompatibilityVersion bool
 }
 
+// ComponentGlobalsRegistry stores the global variables for different components for easy access, including feature gate and effective version of each component.
 type ComponentGlobalsRegistry interface {
 	// EffectiveVersionFor returns the EffectiveVersion registered under the component.
 	// Returns nil if the component is not registered.
-	EffectiveVersionFor(component string) baseversion.EffectiveVersion
+	EffectiveVersionFor(component string) EffectiveVersion
 	// FeatureGateFor returns the FeatureGate registered under the component.
 	// Returns nil if the component is not registered.
-	FeatureGateFor(component string) FeatureGate
+	FeatureGateFor(component string) featuregate.FeatureGate
 	// Register registers the EffectiveVersion and FeatureGate for a component.
 	// returns error if the component is already registered.
-	Register(component string, effectiveVersion baseversion.MutableEffectiveVersion, featureGate MutableVersionedFeatureGate) error
+	Register(component string, effectiveVersion MutableEffectiveVersion, featureGate featuregate.MutableVersionedFeatureGate) error
 	// ComponentGlobalsOrRegister would return the registered global variables for the component if it already exists in the registry.
 	// Otherwise, the provided variables would be registered under the component, and the same variables would be returned.
-	ComponentGlobalsOrRegister(component string, effectiveVersion baseversion.MutableEffectiveVersion, featureGate MutableVersionedFeatureGate) (baseversion.MutableEffectiveVersion, MutableVersionedFeatureGate)
+	ComponentGlobalsOrRegister(component string, effectiveVersion MutableEffectiveVersion, featureGate featuregate.MutableVersionedFeatureGate) (MutableEffectiveVersion, featuregate.MutableVersionedFeatureGate)
 	// AddFlags adds flags of "--emulated-version" and "--feature-gates"
 	AddFlags(fs *pflag.FlagSet)
 	// Set sets the flags for all global variables for all components registered.
+	// A component's feature gate and effective version would not be updated until Set() is called.
 	Set() error
 	// SetFallback calls Set() if it has never been called.
 	SetFallback() error
@@ -118,9 +94,13 @@ type ComponentGlobalsRegistry interface {
 type componentGlobalsRegistry struct {
 	componentGlobals map[string]*ComponentGlobals
 	mutex            sync.RWMutex
-	// list of component name to emulation version set from the flag.
+	// emulationVersionConfig stores the list of component name to emulation version set from the flag.
+	// When the `--emulated-version` flag is parsed, it would not take effect until Set() is called,
+	// because the emulation version needs to be set before the feature gate is set.
 	emulationVersionConfig []string
-	// map of component name to the list of feature gates set from the flag.
+	// featureGatesConfig stores the map of component name to the list of feature gates set from the flag.
+	// When the `--feature-gates` flag is parsed, it would not take effect until Set() is called,
+	// because the emulation version needs to be set before the feature gate is set.
 	featureGatesConfig map[string][]string
 	// set stores if the Set() function for the registry is already called.
 	set bool
@@ -143,7 +123,7 @@ func (r *componentGlobalsRegistry) Reset() {
 	r.set = false
 }
 
-func (r *componentGlobalsRegistry) EffectiveVersionFor(component string) baseversion.EffectiveVersion {
+func (r *componentGlobalsRegistry) EffectiveVersionFor(component string) EffectiveVersion {
 	r.mutex.RLock()
 	defer r.mutex.RUnlock()
 	globals, ok := r.componentGlobals[component]
@@ -153,7 +133,7 @@ func (r *componentGlobalsRegistry) EffectiveVersionFor(component string) basever
 	return globals.effectiveVersion
 }
 
-func (r *componentGlobalsRegistry) FeatureGateFor(component string) FeatureGate {
+func (r *componentGlobalsRegistry) FeatureGateFor(component string) featuregate.FeatureGate {
 	r.mutex.RLock()
 	defer r.mutex.RUnlock()
 	globals, ok := r.componentGlobals[component]
@@ -163,7 +143,7 @@ func (r *componentGlobalsRegistry) FeatureGateFor(component string) FeatureGate
 	return globals.featureGate
 }
 
-func (r *componentGlobalsRegistry) unsafeRegister(component string, effectiveVersion baseversion.MutableEffectiveVersion, featureGate MutableVersionedFeatureGate) error {
+func (r *componentGlobalsRegistry) unsafeRegister(component string, effectiveVersion MutableEffectiveVersion, featureGate featuregate.MutableVersionedFeatureGate) error {
 	if _, ok := r.componentGlobals[component]; ok {
 		return fmt.Errorf("component globals of %s already registered", component)
 	}
@@ -182,7 +162,7 @@ func (r *componentGlobalsRegistry) unsafeRegister(component string, effectiveVer
 	return nil
 }
 
-func (r *componentGlobalsRegistry) Register(component string, effectiveVersion baseversion.MutableEffectiveVersion, featureGate MutableVersionedFeatureGate) error {
+func (r *componentGlobalsRegistry) Register(component string, effectiveVersion MutableEffectiveVersion, featureGate featuregate.MutableVersionedFeatureGate) error {
 	if effectiveVersion == nil {
 		return fmt.Errorf("cannot register nil effectiveVersion")
 	}
@@ -191,7 +171,7 @@ func (r *componentGlobalsRegistry) Register(component string, effectiveVersion b
 	return r.unsafeRegister(component, effectiveVersion, featureGate)
 }
 
-func (r *componentGlobalsRegistry) ComponentGlobalsOrRegister(component string, effectiveVersion baseversion.MutableEffectiveVersion, featureGate MutableVersionedFeatureGate) (baseversion.MutableEffectiveVersion, MutableVersionedFeatureGate) {
+func (r *componentGlobalsRegistry) ComponentGlobalsOrRegister(component string, effectiveVersion MutableEffectiveVersion, featureGate featuregate.MutableVersionedFeatureGate) (MutableEffectiveVersion, featuregate.MutableVersionedFeatureGate) {
 	r.mutex.Lock()
 	defer r.mutex.Unlock()
 	globals, ok := r.componentGlobals[component]
@@ -219,22 +199,16 @@ func (r *componentGlobalsRegistry) unsafeKnownFeatures() []string {
 func (r *componentGlobalsRegistry) unsafeVersionFlagOptions(isEmulation bool) []string {
 	var vs []string
 	for component, globals := range r.componentGlobals {
-		binaryVer := globals.effectiveVersion.BinaryVersion()
 		if isEmulation {
 			if globals.dependentEmulationVersion {
 				continue
 			}
-			// emulated version could be between binaryMajor.{binaryMinor} and binaryMajor.{binaryMinor}
+			vs = append(vs, fmt.Sprintf("%s=%s", component, globals.effectiveVersion.AllowedEmulationVersionRange()))
-			// TODO: change to binaryMajor.{binaryMinor-1} and binaryMajor.{binaryMinor} in 1.32
-			vs = append(vs, fmt.Sprintf("%s=%s..%s (default=%s)", component,
-				binaryVer.SubtractMinor(0).String(), binaryVer.String(), globals.effectiveVersion.EmulationVersion().String()))
 		} else {
 			if globals.dependentMinCompatibilityVersion {
 				continue
 			}
-			// min compatibility version could be between binaryMajor.{binaryMinor-1} and binaryMajor.{binaryMinor}
+			vs = append(vs, fmt.Sprintf("%s=%s", component, globals.effectiveVersion.AllowedMinCompatibilityVersionRange()))
-			vs = append(vs, fmt.Sprintf("%s=%s..%s (default=%s)", component,
-				binaryVer.SubtractMinor(1).String(), binaryVer.String(), globals.effectiveVersion.MinCompatibilityVersion().String()))
 		}
 	}
 	sort.Strings(vs)

staging/src/k8s.io/component-base/compatibility/registry_test.go

@@ -1,5 +1,5 @@
 /*
-Copyright 2024 The Kubernetes Authors.
+Copyright 2025 The Kubernetes Authors.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package featuregate
+package compatibility
 
 import (
 	"fmt"
@@ -25,7 +25,7 @@ import (
 
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
 	"k8s.io/apimachinery/pkg/util/version"
-	baseversion "k8s.io/component-base/version"
+	"k8s.io/component-base/featuregate"
 )
 
 const (
@@ -34,8 +34,8 @@ const (
 
 func TestEffectiveVersionRegistry(t *testing.T) {
 	r := NewComponentGlobalsRegistry()
-	ver1 := baseversion.NewEffectiveVersion("1.31")
+	ver1 := NewEffectiveVersionFromString("1.31", "", "")
-	ver2 := baseversion.NewEffectiveVersion("1.28")
+	ver2 := NewEffectiveVersionFromString("1.28", "", "")
 
 	if r.EffectiveVersionFor(testComponent) != nil {
 		t.Fatalf("expected nil EffectiveVersion initially")
@@ -57,40 +57,40 @@ func TestEffectiveVersionRegistry(t *testing.T) {
 
 func testRegistry(t *testing.T) *componentGlobalsRegistry {
 	r := NewComponentGlobalsRegistry()
-	verKube := baseversion.NewEffectiveVersion("1.31")
+	verKube := NewEffectiveVersionFromString("1.31", "1.31", "1.30")
-	fgKube := NewVersionedFeatureGate(version.MustParse("0.0"))
+	fgKube := featuregate.NewVersionedFeatureGate(version.MustParse("0.0"))
-	err := fgKube.AddVersioned(map[Feature]VersionedSpecs{
+	err := fgKube.AddVersioned(map[featuregate.Feature]featuregate.VersionedSpecs{
 		"kubeA": {
-			{Version: version.MustParse("1.27"), Default: false, PreRelease: Alpha},
+			{Version: version.MustParse("1.27"), Default: false, PreRelease: featuregate.Alpha},
-			{Version: version.MustParse("1.28"), Default: false, PreRelease: Beta},
+			{Version: version.MustParse("1.28"), Default: false, PreRelease: featuregate.Beta},
-			{Version: version.MustParse("1.31"), Default: true, LockToDefault: true, PreRelease: GA},
+			{Version: version.MustParse("1.31"), Default: true, LockToDefault: true, PreRelease: featuregate.GA},
 		},
 		"kubeB": {
-			{Version: version.MustParse("1.30"), Default: false, PreRelease: Alpha},
+			{Version: version.MustParse("1.30"), Default: false, PreRelease: featuregate.Alpha},
 		},
 		"commonC": {
-			{Version: version.MustParse("1.27"), Default: false, PreRelease: Alpha},
+			{Version: version.MustParse("1.27"), Default: false, PreRelease: featuregate.Alpha},
-			{Version: version.MustParse("1.29"), Default: true, PreRelease: Beta},
+			{Version: version.MustParse("1.29"), Default: true, PreRelease: featuregate.Beta},
 		},
 	})
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	verTest := baseversion.NewEffectiveVersion("2.8")
+	verTest := NewEffectiveVersionFromString("2.8", "2.8", "2.7")
-	fgTest := NewVersionedFeatureGate(version.MustParse("0.0"))
+	fgTest := featuregate.NewVersionedFeatureGate(version.MustParse("0.0"))
-	err = fgTest.AddVersioned(map[Feature]VersionedSpecs{
+	err = fgTest.AddVersioned(map[featuregate.Feature]featuregate.VersionedSpecs{
 		"testA": {
-			{Version: version.MustParse("2.7"), Default: false, PreRelease: Alpha},
+			{Version: version.MustParse("2.7"), Default: false, PreRelease: featuregate.Alpha},
-			{Version: version.MustParse("2.8"), Default: false, PreRelease: Beta},
+			{Version: version.MustParse("2.8"), Default: false, PreRelease: featuregate.Beta},
-			{Version: version.MustParse("2.10"), Default: true, PreRelease: GA},
+			{Version: version.MustParse("2.10"), Default: true, PreRelease: featuregate.GA},
 		},
 		"testB": {
-			{Version: version.MustParse("2.9"), Default: false, PreRelease: Alpha},
+			{Version: version.MustParse("2.9"), Default: false, PreRelease: featuregate.Alpha},
 		},
 		"commonC": {
-			{Version: version.MustParse("2.7"), Default: false, PreRelease: Alpha},
+			{Version: version.MustParse("2.7"), Default: false, PreRelease: featuregate.Alpha},
-			{Version: version.MustParse("2.9"), Default: true, PreRelease: Beta},
+			{Version: version.MustParse("2.9"), Default: true, PreRelease: featuregate.Beta},
 		},
 	})
 	if err != nil {
@@ -154,8 +154,8 @@ func TestFlags(t *testing.T) {
 		parseError                   string
 		expectedKubeEmulationVersion string
 		expectedTestEmulationVersion string
-		expectedKubeFeatureValues    map[Feature]bool
+		expectedKubeFeatureValues    map[featuregate.Feature]bool
-		expectedTestFeatureValues    map[Feature]bool
+		expectedTestFeatureValues    map[featuregate.Feature]bool
 	}{
 		{
 			name:                         "setting kube emulation version",
@@ -214,8 +214,8 @@ func TestFlags(t *testing.T) {
 			},
 			expectedKubeEmulationVersion: "1.31",
 			expectedTestEmulationVersion: "2.7",
-			expectedKubeFeatureValues:    map[Feature]bool{"kubeA": true, "kubeB": false, "commonC": true},
+			expectedKubeFeatureValues:    map[featuregate.Feature]bool{"kubeA": true, "kubeB": false, "commonC": true},
-			expectedTestFeatureValues:    map[Feature]bool{"testA": true, "testB": false, "commonC": false},
+			expectedTestFeatureValues:    map[featuregate.Feature]bool{"testA": true, "testB": false, "commonC": false},
 		},
 		{
 			name: "setting future test feature flag",
@@ -235,8 +235,8 @@ func TestFlags(t *testing.T) {
 			},
 			expectedKubeEmulationVersion: "1.30",
 			expectedTestEmulationVersion: "2.7",
-			expectedKubeFeatureValues:    map[Feature]bool{"kubeA": false, "kubeB": true, "commonC": false},
+			expectedKubeFeatureValues:    map[featuregate.Feature]bool{"kubeA": false, "kubeB": true, "commonC": false},
-			expectedTestFeatureValues:    map[Feature]bool{"testA": false, "testB": false, "commonC": true},
+			expectedTestFeatureValues:    map[featuregate.Feature]bool{"testA": false, "testB": false, "commonC": true},
 		},
 		{
 			name: "setting kube feature flag with different prefix",
@@ -313,9 +313,9 @@ func TestFlags(t *testing.T) {
 
 func TestVersionMapping(t *testing.T) {
 	r := NewComponentGlobalsRegistry()
-	ver1 := baseversion.NewEffectiveVersion("0.58")
+	ver1 := NewEffectiveVersionFromString("0.58", "", "")
-	ver2 := baseversion.NewEffectiveVersion("1.28")
+	ver2 := NewEffectiveVersionFromString("1.28", "", "")
-	ver3 := baseversion.NewEffectiveVersion("2.10")
+	ver3 := NewEffectiveVersionFromString("2.10", "", "")
 
 	utilruntime.Must(r.Register("test1", ver1, nil))
 	utilruntime.Must(r.Register("test2", ver2, nil))
@@ -355,9 +355,9 @@ func TestVersionMapping(t *testing.T) {
 
 func TestVersionMappingWithMultipleDependency(t *testing.T) {
 	r := NewComponentGlobalsRegistry()
-	ver1 := baseversion.NewEffectiveVersion("0.58")
+	ver1 := NewEffectiveVersionFromString("0.58", "", "")
-	ver2 := baseversion.NewEffectiveVersion("1.28")
+	ver2 := NewEffectiveVersionFromString("1.28", "", "")
-	ver3 := baseversion.NewEffectiveVersion("2.10")
+	ver3 := NewEffectiveVersionFromString("2.10", "", "")
 
 	utilruntime.Must(r.Register("test1", ver1, nil))
 	utilruntime.Must(r.Register("test2", ver2, nil))
@@ -382,9 +382,9 @@ func TestVersionMappingWithMultipleDependency(t *testing.T) {
 
 func TestVersionMappingWithCyclicDependency(t *testing.T) {
 	r := NewComponentGlobalsRegistry()
-	ver1 := baseversion.NewEffectiveVersion("0.58")
+	ver1 := NewEffectiveVersionFromString("0.58", "", "")
-	ver2 := baseversion.NewEffectiveVersion("1.28")
+	ver2 := NewEffectiveVersionFromString("1.28", "", "")
-	ver3 := baseversion.NewEffectiveVersion("2.10")
+	ver3 := NewEffectiveVersionFromString("2.10", "", "")
 
 	utilruntime.Must(r.Register("test1", ver1, nil))
 	utilruntime.Must(r.Register("test2", ver2, nil))

staging/src/k8s.io/component-base/compatibility/version.go

@@ -0,0 +1,213 @@
+/*
+Copyright 2025 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package compatibility
+
+import (
+	"fmt"
+	"sync/atomic"
+
+	"k8s.io/apimachinery/pkg/util/version"
+	baseversion "k8s.io/component-base/version"
+)
+
+// EffectiveVersion stores all the version information of a component.
+type EffectiveVersion interface {
+	// BinaryVersion is the binary version of a component. Tied to a particular binary release.
+	BinaryVersion() *version.Version
+	// EmulationVersion is the version a component emulate its capabilities (APIs, features, ...) of.
+	// If EmulationVersion is set to be different from BinaryVersion, the component will emulate the behavior of this version instead of the underlying binary version.
+	EmulationVersion() *version.Version
+	// MinCompatibilityVersion is the minimum version a component is compatible with (in terms of storage versions, validation rules, ...).
+	MinCompatibilityVersion() *version.Version
+	EqualTo(other EffectiveVersion) bool
+	String() string
+	Validate() []error
+	// AllowedEmulationVersionRange returns the string of the allowed range of emulation version.
+	// Used only for docs/help.
+	AllowedEmulationVersionRange() string
+	// AllowedMinCompatibilityVersionRange returns the string of the allowed range of min compatibility version.
+	// Used only for docs/help.
+	AllowedMinCompatibilityVersionRange() string
+}
+
+type MutableEffectiveVersion interface {
+	EffectiveVersion
+	SetEmulationVersion(emulationVersion *version.Version)
+	SetMinCompatibilityVersion(minCompatibilityVersion *version.Version)
+}
+
+type effectiveVersion struct {
+	// When true, BinaryVersion() returns the current binary version
+	useDefaultBuildBinaryVersion atomic.Bool
+	// Holds the last binary version stored in Set()
+	binaryVersion atomic.Pointer[version.Version]
+	// If the emulationVersion is set by the users, it could only contain major and minor versions.
+	// In tests, emulationVersion could be the same as the binary version, or set directly,
+	// which can have "alpha" as pre-release to continue serving expired apis while we clean up the test.
+	emulationVersion atomic.Pointer[version.Version]
+	// minCompatibilityVersion could only contain major and minor versions.
+	minCompatibilityVersion atomic.Pointer[version.Version]
+	// emulationVersionFloor is the minimum emulationVersion allowed. No limit if nil.
+	emulationVersionFloor *version.Version
+	// minCompatibilityVersionFloor is the minimum minCompatibilityVersionFloor allowed. No limit if nil.
+	minCompatibilityVersionFloor *version.Version
+}
+
+func (m *effectiveVersion) BinaryVersion() *version.Version {
+	if m.useDefaultBuildBinaryVersion.Load() {
+		return defaultBuildBinaryVersion()
+	}
+	return m.binaryVersion.Load()
+}
+
+func (m *effectiveVersion) EmulationVersion() *version.Version {
+	ver := m.emulationVersion.Load()
+	if ver != nil {
+		// Emulation version can have "alpha" as pre-release to continue serving expired apis while we clean up the test.
+		// The pre-release should not be accessible to the users.
+		return ver.WithPreRelease(m.BinaryVersion().PreRelease())
+	}
+	return ver
+}
+
+func (m *effectiveVersion) MinCompatibilityVersion() *version.Version {
+	return m.minCompatibilityVersion.Load()
+}
+
+func (m *effectiveVersion) EqualTo(other EffectiveVersion) bool {
+	return m.BinaryVersion().EqualTo(other.BinaryVersion()) && m.EmulationVersion().EqualTo(other.EmulationVersion()) && m.MinCompatibilityVersion().EqualTo(other.MinCompatibilityVersion())
+}
+
+func (m *effectiveVersion) String() string {
+	if m == nil {
+		return "<nil>"
+	}
+	return fmt.Sprintf("{BinaryVersion: %s, EmulationVersion: %s, MinCompatibilityVersion: %s}",
+		m.BinaryVersion().String(), m.EmulationVersion().String(), m.MinCompatibilityVersion().String())
+}
+
+func majorMinor(ver *version.Version) *version.Version {
+	if ver == nil {
+		return ver
+	}
+	return version.MajorMinor(ver.Major(), ver.Minor())
+}
+
+func (m *effectiveVersion) SetEmulationVersion(emulationVersion *version.Version) {
+	m.emulationVersion.Store(majorMinor(emulationVersion))
+	// set the default minCompatibilityVersion to be emulationVersion - 1 if possible
+	minCompatibilityVersion := majorMinor(emulationVersion.SubtractMinor(1))
+	if minCompatibilityVersion.LessThan(m.minCompatibilityVersionFloor) {
+		minCompatibilityVersion = m.minCompatibilityVersionFloor
+	}
+	m.minCompatibilityVersion.Store(minCompatibilityVersion)
+}
+
+// SetMinCompatibilityVersion should be called after SetEmulationVersion
+func (m *effectiveVersion) SetMinCompatibilityVersion(minCompatibilityVersion *version.Version) {
+	m.minCompatibilityVersion.Store(majorMinor(minCompatibilityVersion))
+}
+
+func (m *effectiveVersion) AllowedEmulationVersionRange() string {
+	binaryVersion := m.BinaryVersion()
+	if binaryVersion == nil {
+		return ""
+	}
+
+	// Consider patch version to be 0.
+	binaryVersion = version.MajorMinor(binaryVersion.Major(), binaryVersion.Minor())
+
+	floor := m.emulationVersionFloor
+	if floor == nil {
+		floor = version.MajorMinor(0, 0)
+	}
+
+	return fmt.Sprintf("%s..%s (default=%s)", floor.String(), binaryVersion.String(), m.EmulationVersion().String())
+}
+
+func (m *effectiveVersion) AllowedMinCompatibilityVersionRange() string {
+	binaryVersion := m.BinaryVersion()
+	if binaryVersion == nil {
+		return ""
+	}
+
+	// Consider patch version to be 0.
+	binaryVersion = version.MajorMinor(binaryVersion.Major(), binaryVersion.Minor())
+
+	floor := m.minCompatibilityVersionFloor
+	if floor == nil {
+		floor = version.MajorMinor(0, 0)
+	}
+
+	return fmt.Sprintf("%s..%s (default=%s)", floor.String(), binaryVersion.String(), m.MinCompatibilityVersion().String())
+}
+
+func (m *effectiveVersion) Validate() []error {
+	var errs []error
+	// Validate only checks the major and minor versions.
+	binaryVersion := m.BinaryVersion().WithPatch(0)
+	emulationVersion := m.emulationVersion.Load()
+	minCompatibilityVersion := m.minCompatibilityVersion.Load()
+	// emulationVersion can only be between emulationVersionFloor and binaryVersion
+	if emulationVersion.GreaterThan(binaryVersion) || emulationVersion.LessThan(m.emulationVersionFloor) {
+		errs = append(errs, fmt.Errorf("emulation version %s is not between [%s, %s]", emulationVersion.String(), m.emulationVersionFloor.String(), binaryVersion.String()))
+	}
+	// minCompatibilityVersion can only be between minCompatibilityVersionFloor and emulationVersion
+	if minCompatibilityVersion.GreaterThan(emulationVersion) || minCompatibilityVersion.LessThan(m.minCompatibilityVersionFloor) {
+		errs = append(errs, fmt.Errorf("minCompatibilityVersion version %s is not between [%s, %s]", minCompatibilityVersion.String(), m.minCompatibilityVersionFloor.String(), emulationVersion.String()))
+	}
+	return errs
+}
+
+// NewEffectiveVersion creates a MutableEffectiveVersion from the binaryVersion.
+// If useDefaultBuildBinaryVersion is true, the call of BinaryVersion() will always return the current binary version.
+// NewEffectiveVersion(binaryVersion, true) should only be used if the binary version is dynamic.
+// Otherwise, use NewEffectiveVersion(binaryVersion, false) or NewEffectiveVersionFromString.
+func NewEffectiveVersion(binaryVersion *version.Version, useDefaultBuildBinaryVersion bool, emulationVersionFloor, minCompatibilityVersionFloor *version.Version) MutableEffectiveVersion {
+	effective := &effectiveVersion{
+		emulationVersionFloor:        emulationVersionFloor,
+		minCompatibilityVersionFloor: minCompatibilityVersionFloor,
+	}
+	compatVersion := binaryVersion.SubtractMinor(1)
+	effective.binaryVersion.Store(binaryVersion)
+	effective.useDefaultBuildBinaryVersion.Store(useDefaultBuildBinaryVersion)
+	effective.SetEmulationVersion(binaryVersion)
+	effective.SetMinCompatibilityVersion(compatVersion)
+	return effective
+}
+
+// NewEffectiveVersionFromString creates a MutableEffectiveVersion from the binaryVersion string.
+func NewEffectiveVersionFromString(binaryVer, emulationVerFloor, minCompatibilityVerFloor string) MutableEffectiveVersion {
+	if binaryVer == "" {
+		return &effectiveVersion{}
+	}
+	binaryVersion := version.MustParse(binaryVer)
+	emulationVersionFloor := version.MajorMinor(0, 0)
+	if emulationVerFloor != "" {
+		emulationVersionFloor = version.MustParse(emulationVerFloor)
+	}
+	minCompatibilityVersionFloor := version.MajorMinor(0, 0)
+	if minCompatibilityVerFloor != "" {
+		minCompatibilityVersionFloor = version.MustParse(minCompatibilityVerFloor)
+	}
+	return NewEffectiveVersion(binaryVersion, false, emulationVersionFloor, minCompatibilityVersionFloor)
+}
+
+func defaultBuildBinaryVersion() *version.Version {
+	verInfo := baseversion.Get()
+	return version.MustParse(verInfo.String()).WithInfo(verInfo)
+}

staging/src/k8s.io/component-base/compatibility/version_test.go

@@ -0,0 +1,148 @@
+/*
+Copyright 2024 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package compatibility
+
+import (
+	"testing"
+
+	"k8s.io/apimachinery/pkg/util/version"
+)
+
+func TestValidate(t *testing.T) {
+	tests := []struct {
+		name                         string
+		binaryVersion                string
+		emulationVersion             string
+		minCompatibilityVersion      string
+		emulationVersionFloor        string
+		minCompatibilityVersionFloor string
+		expectErrors                 bool
+	}{
+		{
+			name:                    "patch version diff ok",
+			binaryVersion:           "v1.32.1",
+			emulationVersion:        "v1.32.2",
+			minCompatibilityVersion: "v1.32.5",
+		},
+		{
+			name:                    "emulation version greater than binary not ok",
+			binaryVersion:           "v1.32.2",
+			emulationVersion:        "v1.33.0",
+			minCompatibilityVersion: "v1.31.0",
+			expectErrors:            true,
+		},
+		{
+			name:                    "min compatibility version greater than emulation version not ok",
+			binaryVersion:           "v1.32.2",
+			emulationVersion:        "v1.31.0",
+			minCompatibilityVersion: "v1.32.0",
+			expectErrors:            true,
+		},
+		{
+			name:                         "between floor and binary ok",
+			binaryVersion:                "v1.32.1",
+			emulationVersion:             "v1.31.0",
+			minCompatibilityVersion:      "v1.30.0",
+			emulationVersionFloor:        "v1.31.0",
+			minCompatibilityVersionFloor: "v1.30.0",
+		},
+		{
+			name:                         "emulation version less than floor not ok",
+			binaryVersion:                "v1.32.1",
+			emulationVersion:             "v1.30.0",
+			minCompatibilityVersion:      "v1.30.0",
+			emulationVersionFloor:        "v1.31.0",
+			minCompatibilityVersionFloor: "v1.30.0",
+			expectErrors:                 true,
+		},
+		{
+			name:                         "min compatibility version less than floor not ok",
+			binaryVersion:                "v1.32.1",
+			emulationVersion:             "v1.31.0",
+			minCompatibilityVersion:      "v1.29.0",
+			emulationVersionFloor:        "v1.31.0",
+			minCompatibilityVersionFloor: "v1.30.0",
+			expectErrors:                 true,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			effective := NewEffectiveVersionFromString(test.binaryVersion, test.emulationVersionFloor, test.minCompatibilityVersionFloor)
+			emulationVersion := version.MustParseGeneric(test.emulationVersion)
+			minCompatibilityVersion := version.MustParseGeneric(test.minCompatibilityVersion)
+			effective.SetEmulationVersion(emulationVersion)
+			effective.SetMinCompatibilityVersion(minCompatibilityVersion)
+
+			errs := effective.Validate()
+			if len(errs) > 0 && !test.expectErrors {
+				t.Errorf("expected no errors, errors found %+v", errs)
+			}
+
+			if len(errs) == 0 && test.expectErrors {
+				t.Errorf("expected errors, no errors found")
+			}
+		})
+	}
+}
+
+func TestSetEmulationVersion(t *testing.T) {
+	tests := []struct {
+		name                          string
+		binaryVersion                 string
+		emulationVersion              string
+		expectMinCompatibilityVersion string
+		emulationVersionFloor         string
+		minCompatibilityVersionFloor  string
+	}{
+		{
+			name:                          "minCompatibilityVersion default to 1 minor less than emulationVersion",
+			binaryVersion:                 "v1.34",
+			emulationVersion:              "v1.32",
+			expectMinCompatibilityVersion: "v1.31",
+			emulationVersionFloor:         "v1.31",
+			minCompatibilityVersionFloor:  "v1.31",
+		},
+		{
+			name:                          "minCompatibilityVersion default to emulationVersion when hitting the floor",
+			binaryVersion:                 "v1.34",
+			emulationVersion:              "v1.31",
+			expectMinCompatibilityVersion: "v1.31",
+			emulationVersionFloor:         "v1.31",
+			minCompatibilityVersionFloor:  "v1.31",
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			effective := NewEffectiveVersionFromString(test.binaryVersion, test.emulationVersionFloor, test.minCompatibilityVersionFloor)
+
+			emulationVersion := version.MustParseGeneric(test.emulationVersion)
+			effective.SetEmulationVersion(emulationVersion)
+			errs := effective.Validate()
+			if len(errs) > 0 {
+				t.Fatalf("expected no Validate errors, errors found %+v", errs)
+				return
+			}
+
+			expectMinCompatibilityVersion := version.MustParseGeneric(test.expectMinCompatibilityVersion)
+			if !effective.MinCompatibilityVersion().EqualTo(expectMinCompatibilityVersion) {
+				t.Errorf("expected minCompatibilityVersion %s, got %s", expectMinCompatibilityVersion.String(), effective.MinCompatibilityVersion().String())
+			}
+		})
+	}
+}

staging/src/k8s.io/component-base/version/version.go

@@ -19,43 +19,10 @@ package version
 import (
 	"fmt"
 	"runtime"
-	"sync/atomic"
 
-	"k8s.io/apimachinery/pkg/util/version"
 	apimachineryversion "k8s.io/apimachinery/pkg/version"
 )
 
-var minimumKubeEmulationVersion *version.Version = version.MajorMinor(1, 31)
-
-type EffectiveVersion interface {
-	BinaryVersion() *version.Version
-	EmulationVersion() *version.Version
-	MinCompatibilityVersion() *version.Version
-	EqualTo(other EffectiveVersion) bool
-	String() string
-	Validate() []error
-}
-
-type MutableEffectiveVersion interface {
-	EffectiveVersion
-	Set(binaryVersion, emulationVersion, minCompatibilityVersion *version.Version)
-	SetEmulationVersion(emulationVersion *version.Version)
-	SetMinCompatibilityVersion(minCompatibilityVersion *version.Version)
-}
-
-type effectiveVersion struct {
-	// When true, BinaryVersion() returns the current binary version
-	useDefaultBuildBinaryVersion atomic.Bool
-	// Holds the last binary version stored in Set()
-	binaryVersion atomic.Pointer[version.Version]
-	// If the emulationVersion is set by the users, it could only contain major and minor versions.
-	// In tests, emulationVersion could be the same as the binary version, or set directly,
-	// which can have "alpha" as pre-release to continue serving expired apis while we clean up the test.
-	emulationVersion atomic.Pointer[version.Version]
-	// minCompatibilityVersion could only contain major and minor versions.
-	minCompatibilityVersion atomic.Pointer[version.Version]
-}
-
 // Get returns the overall codebase version. It's for detecting
 // what code a binary was built from.
 func Get() apimachineryversion.Info {
@@ -73,134 +40,3 @@ func Get() apimachineryversion.Info {
 		Platform:     fmt.Sprintf("%s/%s", runtime.GOOS, runtime.GOARCH),
 	}
 }
-
-func (m *effectiveVersion) BinaryVersion() *version.Version {
-	if m.useDefaultBuildBinaryVersion.Load() {
-		return defaultBuildBinaryVersion()
-	}
-	return m.binaryVersion.Load()
-}
-
-func (m *effectiveVersion) EmulationVersion() *version.Version {
-	ver := m.emulationVersion.Load()
-	if ver != nil {
-		// Emulation version can have "alpha" as pre-release to continue serving expired apis while we clean up the test.
-		// The pre-release should not be accessible to the users.
-		return ver.WithPreRelease(m.BinaryVersion().PreRelease())
-	}
-	return ver
-}
-
-func (m *effectiveVersion) MinCompatibilityVersion() *version.Version {
-	return m.minCompatibilityVersion.Load()
-}
-
-func (m *effectiveVersion) EqualTo(other EffectiveVersion) bool {
-	return m.BinaryVersion().EqualTo(other.BinaryVersion()) && m.EmulationVersion().EqualTo(other.EmulationVersion()) && m.MinCompatibilityVersion().EqualTo(other.MinCompatibilityVersion())
-}
-
-func (m *effectiveVersion) String() string {
-	if m == nil {
-		return "<nil>"
-	}
-	return fmt.Sprintf("{BinaryVersion: %s, EmulationVersion: %s, MinCompatibilityVersion: %s}",
-		m.BinaryVersion().String(), m.EmulationVersion().String(), m.MinCompatibilityVersion().String())
-}
-
-func majorMinor(ver *version.Version) *version.Version {
-	if ver == nil {
-		return ver
-	}
-	return version.MajorMinor(ver.Major(), ver.Minor())
-}
-
-func (m *effectiveVersion) Set(binaryVersion, emulationVersion, minCompatibilityVersion *version.Version) {
-	m.binaryVersion.Store(binaryVersion)
-	m.useDefaultBuildBinaryVersion.Store(false)
-	m.emulationVersion.Store(majorMinor(emulationVersion))
-	m.minCompatibilityVersion.Store(majorMinor(minCompatibilityVersion))
-}
-
-func (m *effectiveVersion) SetEmulationVersion(emulationVersion *version.Version) {
-	m.emulationVersion.Store(majorMinor(emulationVersion))
-	// set the default minCompatibilityVersion to be emulationVersion - 1
-	m.minCompatibilityVersion.Store(majorMinor(emulationVersion.SubtractMinor(1)))
-}
-
-// SetMinCompatibilityVersion should be called after SetEmulationVersion
-func (m *effectiveVersion) SetMinCompatibilityVersion(minCompatibilityVersion *version.Version) {
-	m.minCompatibilityVersion.Store(majorMinor(minCompatibilityVersion))
-}
-
-func (m *effectiveVersion) Validate() []error {
-	var errs []error
-	// Validate only checks the major and minor versions.
-	binaryVersion := m.BinaryVersion().WithPatch(0)
-	emulationVersion := m.emulationVersion.Load()
-	minCompatibilityVersion := m.minCompatibilityVersion.Load()
-
-	// emulationVersion can only be 1.{binaryMinor-3}...1.{binaryMinor}
-	maxEmuVer := binaryVersion
-	minEmuVer := binaryVersion.SubtractMinor(3)
-	if emulationVersion.GreaterThan(maxEmuVer) || emulationVersion.LessThan(minEmuVer) {
-		errs = append(errs, fmt.Errorf("emulation version %s is not between [%s, %s]", emulationVersion.String(), minEmuVer.String(), maxEmuVer.String()))
-	}
-	// minCompatibilityVersion can only be 1.{binaryMinor-3} to 1.{binaryMinor}
-	maxCompVer := emulationVersion
-	minCompVer := binaryVersion.SubtractMinor(4)
-	if minCompatibilityVersion.GreaterThan(maxCompVer) || minCompatibilityVersion.LessThan(minCompVer) {
-		errs = append(errs, fmt.Errorf("minCompatibilityVersion version %s is not between [%s, %s]", minCompatibilityVersion.String(), minCompVer.String(), maxCompVer.String()))
-	}
-	return errs
-}
-
-func newEffectiveVersion(binaryVersion *version.Version, useDefaultBuildBinaryVersion bool) MutableEffectiveVersion {
-	effective := &effectiveVersion{}
-	compatVersion := binaryVersion.SubtractMinor(1)
-	effective.Set(binaryVersion, binaryVersion, compatVersion)
-	effective.useDefaultBuildBinaryVersion.Store(useDefaultBuildBinaryVersion)
-	return effective
-}
-
-func NewEffectiveVersion(binaryVer string) MutableEffectiveVersion {
-	if binaryVer == "" {
-		return &effectiveVersion{}
-	}
-	binaryVersion := version.MustParse(binaryVer)
-	return newEffectiveVersion(binaryVersion, false)
-}
-
-func defaultBuildBinaryVersion() *version.Version {
-	verInfo := Get()
-	return version.MustParse(verInfo.String()).WithInfo(verInfo)
-}
-
-// DefaultBuildEffectiveVersion returns the MutableEffectiveVersion based on the
-// current build information.
-func DefaultBuildEffectiveVersion() MutableEffectiveVersion {
-	binaryVersion := defaultBuildBinaryVersion()
-	if binaryVersion.Major() == 0 && binaryVersion.Minor() == 0 {
-		return DefaultKubeEffectiveVersion()
-	}
-	return newEffectiveVersion(binaryVersion, true)
-}
-
-// DefaultKubeEffectiveVersion returns the MutableEffectiveVersion based on the
-// latest K8s release.
-func DefaultKubeEffectiveVersion() MutableEffectiveVersion {
-	binaryVersion := version.MustParse(DefaultKubeBinaryVersion).WithInfo(Get())
-	return newEffectiveVersion(binaryVersion, false)
-}
-
-// ValidateKubeEffectiveVersion validates the EmulationVersion is at least 1.31 and MinCompatibilityVersion
-// is at least 1.30 for kube components.
-func ValidateKubeEffectiveVersion(effectiveVersion EffectiveVersion) error {
-	if !effectiveVersion.EmulationVersion().AtLeast(minimumKubeEmulationVersion) {
-		return fmt.Errorf("emulation version needs to be greater or equal to 1.31, got %s", effectiveVersion.EmulationVersion().String())
-	}
-	if !effectiveVersion.MinCompatibilityVersion().AtLeast(minimumKubeEmulationVersion.SubtractMinor(1)) {
-		return fmt.Errorf("minCompatibilityVersion version needs to be greater or equal to 1.30, got %s", effectiveVersion.MinCompatibilityVersion().String())
-	}
-
-	return nil
-}

staging/src/k8s.io/component-base/version/version_test.go

@@ -1,185 +0,0 @@
-/*
-Copyright 2024 The Kubernetes Authors.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package version
-
-import (
-	"testing"
-
-	"k8s.io/apimachinery/pkg/util/version"
-)
-
-func TestValidate(t *testing.T) {
-	tests := []struct {
-		name                    string
-		binaryVersion           string
-		emulationVersion        string
-		minCompatibilityVersion string
-		expectErrors            bool
-	}{
-		{
-			name:                    "patch version diff ok",
-			binaryVersion:           "v1.32.2",
-			emulationVersion:        "v1.32.1",
-			minCompatibilityVersion: "v1.31.5",
-		},
-		{
-			name:                    "emulation version one minor lower than binary ok",
-			binaryVersion:           "v1.32.2",
-			emulationVersion:        "v1.31.0",
-			minCompatibilityVersion: "v1.31.0",
-		},
-		{
-			name:                    "emulation version two minor lower than binary ok",
-			binaryVersion:           "v1.33.2",
-			emulationVersion:        "v1.31.0",
-			minCompatibilityVersion: "v1.31.0",
-			expectErrors:            false,
-		},
-		{
-			name:                    "emulation version three minor lower than binary ok",
-			binaryVersion:           "v1.35.0",
-			emulationVersion:        "v1.32.0",
-			minCompatibilityVersion: "v1.32.0",
-		},
-		{
-			name:                    "emulation version four minor lower than binary not ok",
-			binaryVersion:           "v1.36.0",
-			emulationVersion:        "v1.32.0",
-			minCompatibilityVersion: "v1.32.0",
-			expectErrors:            true,
-		},
-		{
-			name:                    "emulation version one minor higher than binary not ok",
-			binaryVersion:           "v1.32.2",
-			emulationVersion:        "v1.33.0",
-			minCompatibilityVersion: "v1.31.0",
-			expectErrors:            true,
-		},
-		{
-			name:                    "emulation version two minor higher than binary not ok",
-			binaryVersion:           "v1.32.2",
-			emulationVersion:        "v1.34.0",
-			minCompatibilityVersion: "v1.31.0",
-			expectErrors:            true,
-		},
-		{
-			name:                    "compatibility version same as binary ok",
-			binaryVersion:           "v1.32.2",
-			emulationVersion:        "v1.32.0",
-			minCompatibilityVersion: "v1.32.0",
-			expectErrors:            false,
-		},
-		{
-			name:                    "compatibility version two minor lower than binary ok",
-			binaryVersion:           "v1.32.2",
-			emulationVersion:        "v1.32.0",
-			minCompatibilityVersion: "v1.30.0",
-			expectErrors:            false,
-		},
-		{
-			name:                    "compatibility version three minor lower than binary ok",
-			binaryVersion:           "v1.34.2",
-			emulationVersion:        "v1.33.0",
-			minCompatibilityVersion: "v1.31.0",
-			expectErrors:            false,
-		},
-		{
-			name:                    "compatibility version one minor higher than binary not ok",
-			binaryVersion:           "v1.32.2",
-			emulationVersion:        "v1.32.0",
-			minCompatibilityVersion: "v1.33.0",
-			expectErrors:            true,
-		},
-		{
-			name:                    "emulation version lower than compatibility version not ok",
-			binaryVersion:           "v1.34.2",
-			emulationVersion:        "v1.32.0",
-			minCompatibilityVersion: "v1.33.0",
-			expectErrors:            true,
-		},
-	}
-
-	for _, test := range tests {
-		t.Run(test.name, func(t *testing.T) {
-			binaryVersion := version.MustParseGeneric(test.binaryVersion)
-			effective := &effectiveVersion{}
-			emulationVersion := version.MustParseGeneric(test.emulationVersion)
-			minCompatibilityVersion := version.MustParseGeneric(test.minCompatibilityVersion)
-			effective.Set(binaryVersion, emulationVersion, minCompatibilityVersion)
-
-			errs := effective.Validate()
-			if len(errs) > 0 && !test.expectErrors {
-				t.Errorf("expected no errors, errors found %+v", errs)
-			}
-
-			if len(errs) == 0 && test.expectErrors {
-				t.Errorf("expected errors, no errors found")
-			}
-		})
-	}
-}
-
-func TestValidateKubeEffectiveVersion(t *testing.T) {
-	tests := []struct {
-		name                    string
-		emulationVersion        string
-		minCompatibilityVersion string
-		expectErr               bool
-	}{
-		{
-			name:                    "valid versions",
-			emulationVersion:        "v1.31.0",
-			minCompatibilityVersion: "v1.31.0",
-			expectErr:               false,
-		},
-		{
-			name:                    "emulationVersion too low",
-			emulationVersion:        "v1.30.0",
-			minCompatibilityVersion: "v1.31.0",
-			expectErr:               true,
-		},
-		{
-			name:                    "minCompatibilityVersion too low",
-			emulationVersion:        "v1.31.0",
-			minCompatibilityVersion: "v1.29.0",
-			expectErr:               true,
-		},
-		{
-			name:                    "both versions too low",
-			emulationVersion:        "v1.30.0",
-			minCompatibilityVersion: "v1.30.0",
-			expectErr:               true,
-		},
-	}
-
-	for _, test := range tests {
-		t.Run(test.name, func(t *testing.T) {
-
-			effective := NewEffectiveVersion("1.32")
-			effective.SetEmulationVersion(version.MustParseGeneric(test.emulationVersion))
-			effective.SetMinCompatibilityVersion(version.MustParseGeneric(test.minCompatibilityVersion))
-
-			err := ValidateKubeEffectiveVersion(effective)
-			if test.expectErr && err == nil {
-				t.Error("expected error, but got nil")
-			}
-			if !test.expectErr && err != nil {
-				t.Errorf("unexpected error: %v", err)
-			}
-		})
-	}
-}

staging/src/k8s.io/component-base/zpages/statusz/registry.go

@@ -20,9 +20,9 @@ import (
 	"time"
 
 	"k8s.io/apimachinery/pkg/util/version"
-	"k8s.io/component-base/featuregate"
 	"k8s.io/klog/v2"
 
+	"k8s.io/component-base/compatibility"
 	compbasemetrics "k8s.io/component-base/metrics"
 	utilversion "k8s.io/component-base/version"
 )
@@ -34,9 +34,12 @@ type statuszRegistry interface {
 	emulationVersion() *version.Version
 }
 
-type registry struct{}
+type registry struct {
+	// componentGlobalsRegistry compatibility.ComponentGlobalsRegistry
+	effectiveVersion compatibility.EffectiveVersion
+}
 
-func (registry) processStartTime() time.Time {
+func (*registry) processStartTime() time.Time {
 	start, err := compbasemetrics.GetProcessStart()
 	if err != nil {
 		klog.Errorf("Could not get process start time, %v", err)
@@ -45,23 +48,20 @@ func (registry) processStartTime() time.Time {
 	return time.Unix(int64(start), 0)
 }
 
-func (registry) goVersion() string {
+func (*registry) goVersion() string {
 	return utilversion.Get().GoVersion
 }
 
-func (registry) binaryVersion() *version.Version {
+func (r *registry) binaryVersion() *version.Version {
-	effectiveVer := featuregate.DefaultComponentGlobalsRegistry.EffectiveVersionFor(featuregate.DefaultKubeComponent)
+	if r.effectiveVersion != nil {
-	if effectiveVer != nil {
+		return r.effectiveVersion.BinaryVersion()
-		return effectiveVer.BinaryVersion()
+	}
+	return version.MustParse(utilversion.Get().String())
 }
 
-	return utilversion.DefaultKubeEffectiveVersion().BinaryVersion()
+func (r *registry) emulationVersion() *version.Version {
-}
+	if r.effectiveVersion != nil {
-
+		return r.effectiveVersion.EmulationVersion()
-func (registry) emulationVersion() *version.Version {
-	effectiveVer := featuregate.DefaultComponentGlobalsRegistry.EffectiveVersionFor(featuregate.DefaultKubeComponent)
-	if effectiveVer != nil {
-		return effectiveVer.EmulationVersion()
 	}
 
 	return nil

staging/src/k8s.io/component-base/zpages/statusz/registry_test.go

@@ -20,14 +20,12 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
-	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
 	"k8s.io/apimachinery/pkg/util/version"
-	"k8s.io/component-base/featuregate"
+	"k8s.io/component-base/compatibility"
 	utilversion "k8s.io/component-base/version"
 )
 
 func TestBinaryVersion(t *testing.T) {
-	componentGlobalsRegistry := featuregate.DefaultComponentGlobalsRegistry
 	tests := []struct {
 		name                    string
 		setFakeEffectiveVersion bool
@@ -42,20 +40,18 @@ func TestBinaryVersion(t *testing.T) {
 		},
 		{
 			name:              "binaryVersion without effective version",
-			wantBinaryVersion: utilversion.DefaultKubeEffectiveVersion().BinaryVersion(),
+			wantBinaryVersion: version.MustParse(utilversion.Get().String()),
 		},
 	}
 
 	for _, tt := range tests {
-		componentGlobalsRegistry.Reset()
 		t.Run(tt.name, func(t *testing.T) {
+			registry := &registry{}
 			if tt.setFakeEffectiveVersion {
-				verKube := utilversion.NewEffectiveVersion(tt.fakeVersion)
+				verKube := compatibility.NewEffectiveVersionFromString(tt.fakeVersion, "", "")
-				fg := featuregate.NewVersionedFeatureGate(version.MustParse(tt.fakeVersion))
+				registry.effectiveVersion = verKube
-				utilruntime.Must(componentGlobalsRegistry.Register(featuregate.DefaultKubeComponent, verKube, fg))
 			}
 
-			registry := &registry{}
 			got := registry.binaryVersion()
 			assert.Equal(t, tt.wantBinaryVersion, got)
 		})
@@ -63,7 +59,6 @@ func TestBinaryVersion(t *testing.T) {
 }
 
 func TestEmulationVersion(t *testing.T) {
-	componentGlobalsRegistry := featuregate.DefaultComponentGlobalsRegistry
 	tests := []struct {
 		name                    string
 		setFakeEffectiveVersion bool
@@ -83,16 +78,14 @@ func TestEmulationVersion(t *testing.T) {
 	}
 
 	for _, tt := range tests {
-		componentGlobalsRegistry.Reset()
 		t.Run(tt.name, func(t *testing.T) {
+			registry := &registry{}
 			if tt.setFakeEffectiveVersion {
-				verKube := utilversion.NewEffectiveVersion("0.0.0")
+				verKube := compatibility.NewEffectiveVersionFromString("0.0.0", "", "")
 				verKube.SetEmulationVersion(version.MustParse(tt.fakeEmulVer))
-				fg := featuregate.NewVersionedFeatureGate(version.MustParse(tt.fakeEmulVer))
+				registry.effectiveVersion = verKube
-				utilruntime.Must(componentGlobalsRegistry.Register(featuregate.DefaultKubeComponent, verKube, fg))
 			}
 
-			registry := &registry{}
 			got := registry.emulationVersion()
 			if tt.wantEmul != nil && got != nil {
 				assert.Equal(t, tt.wantEmul.Major(), got.Major())

staging/src/k8s.io/component-base/zpages/statusz/statusz.go

@@ -24,6 +24,7 @@ import (
 	"net/http"
 	"time"
 
+	"k8s.io/component-base/compatibility"
 	"k8s.io/component-base/zpages/httputil"
 	"k8s.io/klog/v2"
 )
@@ -62,8 +63,8 @@ type mux interface {
 	Handle(path string, handler http.Handler)
 }
 
-func NewRegistry() statuszRegistry {
+func NewRegistry(effectiveVersion compatibility.EffectiveVersion) statuszRegistry {
-	return registry{}
+	return &registry{effectiveVersion: effectiveVersion}
 }
 
 func Install(m mux, componentName string, reg statuszRegistry) {

staging/src/k8s.io/cri-client/go.mod

@@ -45,7 +45,6 @@ require (
 	github.com/google/gofuzz v1.2.0 // indirect
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.20.0 // indirect
-	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/mailru/easyjson v0.7.7 // indirect
@@ -57,7 +56,6 @@ require (
 	github.com/prometheus/client_model v0.6.1 // indirect
 	github.com/prometheus/common v0.55.0 // indirect
 	github.com/prometheus/procfs v0.15.1 // indirect
-	github.com/spf13/cobra v1.8.1 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/x448/float16 v0.8.4 // indirect
 	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.53.0 // indirect

staging/src/k8s.io/cri-client/go.sum

@@ -18,7 +18,6 @@ github.com/census-instrumentation/opencensus-proto v0.4.1/go.mod h1:4T9NM4+4Vw91
 github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
 github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/cncf/xds/go v0.0.0-20240423153145-555b57ec207b/go.mod h1:W+zGtBO5Y1IgJhy4+A9GOqVhqLpfZi+vwmdNXUehLA8=
-github.com/cpuguy83/go-md2man/v2 v2.0.4/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
@@ -70,7 +69,6 @@ github.com/gorilla/websocket v1.5.0/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/ad
 github.com/gregjones/httpcache v0.0.0-20190611155906-901d90724c79/go.mod h1:FecbI9+v66THATjSRHfNgh1IVFe/9kFxbXtjV0ctIMA=
 github.com/grpc-ecosystem/grpc-gateway/v2 v2.20.0 h1:bkypFPDjIYGfCYD5mRBvpqxfYX1YCS1PXdKYWi8FsN0=
 github.com/grpc-ecosystem/grpc-gateway/v2 v2.20.0/go.mod h1:P+Lt/0by1T8bfcF3z737NnSbmxQAppXMRziHUxPOC8k=
-github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
 github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
 github.com/josharian/intern v1.0.0 h1:vlS4z54oSdjm0bgjRigI+G1HpF+tI+9rE5LLzOg8HmY=
 github.com/josharian/intern v1.0.0/go.mod h1:5DoeVV0s6jJacbCEi61lwdGj/aVlrQvzHFFd8Hwg//Y=
@@ -117,9 +115,7 @@ github.com/prometheus/procfs v0.15.1/go.mod h1:fB45yRUv8NstnjriLhBQLuOUt+WW4BsoG
 github.com/rogpeppe/fastuuid v1.2.0/go.mod h1:jVj6XXZzXRy/MSR5jhDC/2q6DgLz+nrA6LYCDYWNEvQ=
 github.com/rogpeppe/go-internal v1.12.0 h1:exVL4IDcn6na9z1rAb56Vxr+CgyK3nn3O+epU5NdKM8=
 github.com/rogpeppe/go-internal v1.12.0/go.mod h1:E+RYuTGaKKdloAfM02xzb0FW3Paa99yedzYV+kq4uf4=
-github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
 github.com/sirupsen/logrus v1.9.3/go.mod h1:naHLuLoDiP4jHNo9R0sCBMtWGeIprob74mVsIT4qYEQ=
-github.com/spf13/cobra v1.8.1 h1:e5/vxKd/rZsfSJMUX1agtjeTDf+qv1/JdBF8gg5k9ZM=
 github.com/spf13/cobra v1.8.1/go.mod h1:wHxEcudfqmLYa8iTfL+OuZPbBZkmvliBWKIezN3kD9Y=
 github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=

staging/src/k8s.io/kube-aggregator/pkg/cmd/server/start.go

@@ -31,7 +31,6 @@ import (
 	genericapiserver "k8s.io/apiserver/pkg/server"
 	"k8s.io/apiserver/pkg/server/filters"
 	genericoptions "k8s.io/apiserver/pkg/server/options"
-	"k8s.io/component-base/featuregate"
 	"k8s.io/kube-aggregator/pkg/apis/apiregistration/v1beta1"
 	"k8s.io/kube-aggregator/pkg/apiserver"
 	aggregatorscheme "k8s.io/kube-aggregator/pkg/apiserver/scheme"
@@ -63,7 +62,7 @@ func NewCommandStartAggregator(ctx context.Context, defaults *AggregatorOptions)
 		Short: "Launch a API aggregator and proxy server",
 		Long:  "Launch a API aggregator and proxy server",
 		PersistentPreRunE: func(*cobra.Command, []string) error {
-			return featuregate.DefaultComponentGlobalsRegistry.Set()
+			return o.ServerRunOptions.ComponentGlobalsRegistry.Set()
 		},
 		RunE: func(c *cobra.Command, args []string) error {
 			if err := o.Complete(); err != nil {

staging/src/k8s.io/sample-apiserver/pkg/cmd/server/start.go

@@ -33,9 +33,11 @@ import (
 	"k8s.io/apiserver/pkg/endpoints/openapi"
 	genericapiserver "k8s.io/apiserver/pkg/server"
 	genericoptions "k8s.io/apiserver/pkg/server/options"
+	"k8s.io/apiserver/pkg/util/compatibility"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
+	basecompatibility "k8s.io/component-base/compatibility"
 	"k8s.io/component-base/featuregate"
-	utilversion "k8s.io/component-base/version"
+	baseversion "k8s.io/component-base/version"
 	"k8s.io/sample-apiserver/pkg/admission/plugin/banflunder"
 	"k8s.io/sample-apiserver/pkg/admission/wardleinitializer"
 	"k8s.io/sample-apiserver/pkg/apis/wardle/v1alpha1"
@@ -51,6 +53,8 @@ const defaultEtcdPathPrefix = "/registry/wardle.example.com"
 // WardleServerOptions contains state for master/api server
 type WardleServerOptions struct {
 	RecommendedOptions *genericoptions.RecommendedOptions
+	// ComponentGlobalsRegistry is the registry where the effective versions and feature gates for all components are stored.
+	ComponentGlobalsRegistry basecompatibility.ComponentGlobalsRegistry
 
 	SharedInformerFactory informers.SharedInformerFactory
 	StdOut                io.Writer
@@ -63,7 +67,7 @@ func WardleVersionToKubeVersion(ver *version.Version) *version.Version {
 	if ver.Major() != 1 {
 		return nil
 	}
-	kubeVer := utilversion.DefaultKubeEffectiveVersion().BinaryVersion()
+	kubeVer := version.MustParse(baseversion.DefaultKubeBinaryVersion)
 	// "1.2" maps to kubeVer
 	offset := int(ver.Minor()) - 2
 	mappedVer := kubeVer.OffsetMinor(offset)
@@ -80,6 +84,7 @@ func NewWardleServerOptions(out, errOut io.Writer) *WardleServerOptions {
 			defaultEtcdPathPrefix,
 			apiserver.Codecs.LegacyCodec(v1alpha1.SchemeGroupVersion),
 		),
+		ComponentGlobalsRegistry: compatibility.DefaultComponentGlobalsRegistry,
 
 		StdOut: out,
 		StdErr: errOut,
@@ -99,7 +104,7 @@ func NewCommandStartWardleServer(ctx context.Context, defaults *WardleServerOpti
 			if skipDefaultComponentGlobalsRegistrySet {
 				return nil
 			}
-			return featuregate.DefaultComponentGlobalsRegistry.Set()
+			return defaults.ComponentGlobalsRegistry.Set()
 		},
 		RunE: func(c *cobra.Command, args []string) error {
 			if err := o.Complete(); err != nil {
@@ -135,8 +140,8 @@ func NewCommandStartWardleServer(ctx context.Context, defaults *WardleServerOpti
 	// Register the "Wardle" component with the global component registry,
 	// associating it with its effective version and feature gate configuration.
 	// Will skip if the component has been registered, like in the integration test.
-	_, wardleFeatureGate := featuregate.DefaultComponentGlobalsRegistry.ComponentGlobalsOrRegister(
+	_, wardleFeatureGate := defaults.ComponentGlobalsRegistry.ComponentGlobalsOrRegister(
-		apiserver.WardleComponentName, utilversion.NewEffectiveVersion(defaultWardleVersion),
+		apiserver.WardleComponentName, basecompatibility.NewEffectiveVersionFromString(defaultWardleVersion, "", ""),
 		featuregate.NewVersionedFeatureGate(version.MustParse(defaultWardleVersion)))
 
 	// Add versioned feature specifications for the "BanFlunder" feature.
@@ -150,14 +155,14 @@ func NewCommandStartWardleServer(ctx context.Context, defaults *WardleServerOpti
 	}))
 
 	// Register the default kube component if not already present in the global registry.
-	_, _ = featuregate.DefaultComponentGlobalsRegistry.ComponentGlobalsOrRegister(featuregate.DefaultKubeComponent,
+	_, _ = defaults.ComponentGlobalsRegistry.ComponentGlobalsOrRegister(basecompatibility.DefaultKubeComponent,
-		utilversion.NewEffectiveVersion(utilversion.DefaultKubeBinaryVersion), utilfeature.DefaultMutableFeatureGate)
+		basecompatibility.NewEffectiveVersionFromString(baseversion.DefaultKubeBinaryVersion, "", ""), utilfeature.DefaultMutableFeatureGate)
 
 	// Set the emulation version mapping from the "Wardle" component to the kube component.
 	// This ensures that the emulation version of the latter is determined by the emulation version of the former.
-	utilruntime.Must(featuregate.DefaultComponentGlobalsRegistry.SetEmulationVersionMapping(apiserver.WardleComponentName, featuregate.DefaultKubeComponent, WardleVersionToKubeVersion))
+	utilruntime.Must(defaults.ComponentGlobalsRegistry.SetEmulationVersionMapping(apiserver.WardleComponentName, basecompatibility.DefaultKubeComponent, WardleVersionToKubeVersion))
 
-	featuregate.DefaultComponentGlobalsRegistry.AddFlags(flags)
+	defaults.ComponentGlobalsRegistry.AddFlags(flags)
 
 	return cmd
 }
@@ -166,13 +171,13 @@ func NewCommandStartWardleServer(ctx context.Context, defaults *WardleServerOpti
 func (o WardleServerOptions) Validate(args []string) error {
 	errors := []error{}
 	errors = append(errors, o.RecommendedOptions.Validate()...)
-	errors = append(errors, featuregate.DefaultComponentGlobalsRegistry.Validate()...)
+	errors = append(errors, o.ComponentGlobalsRegistry.Validate()...)
 	return utilerrors.NewAggregate(errors)
 }
 
 // Complete fills in fields required to have valid data
 func (o *WardleServerOptions) Complete() error {
-	if featuregate.DefaultComponentGlobalsRegistry.FeatureGateFor(apiserver.WardleComponentName).Enabled("BanFlunder") {
+	if o.ComponentGlobalsRegistry.FeatureGateFor(apiserver.WardleComponentName).Enabled("BanFlunder") {
 		// register admission plugins
 		banflunder.Register(o.RecommendedOptions.Admission.Plugins)
 
@@ -209,8 +214,8 @@ func (o *WardleServerOptions) Config() (*apiserver.Config, error) {
 	serverConfig.OpenAPIV3Config.Info.Title = "Wardle"
 	serverConfig.OpenAPIV3Config.Info.Version = "0.1"
 
-	serverConfig.FeatureGate = featuregate.DefaultComponentGlobalsRegistry.FeatureGateFor(featuregate.DefaultKubeComponent)
+	serverConfig.FeatureGate = o.ComponentGlobalsRegistry.FeatureGateFor(basecompatibility.DefaultKubeComponent)
-	serverConfig.EffectiveVersion = featuregate.DefaultComponentGlobalsRegistry.EffectiveVersionFor(apiserver.WardleComponentName)
+	serverConfig.EffectiveVersion = o.ComponentGlobalsRegistry.EffectiveVersionFor(apiserver.WardleComponentName)
 
 	if err := o.RecommendedOptions.ApplyTo(serverConfig); err != nil {
 		return nil, err

staging/src/k8s.io/sample-apiserver/pkg/cmd/server/start_test.go

@@ -20,13 +20,13 @@ import (
 	"testing"
 
 	"k8s.io/apimachinery/pkg/util/version"
-	utilversion "k8s.io/component-base/version"
+	"k8s.io/apiserver/pkg/util/compatibility"
 
 	"github.com/stretchr/testify/assert"
 )
 
 func TestWardleEmulationVersionToKubeEmulationVersion(t *testing.T) {
-	defaultKubeEffectiveVersion := utilversion.DefaultKubeEffectiveVersion()
+	defaultKubeEffectiveVersion := compatibility.DefaultKubeEffectiveVersionForTest()
 
 	testCases := []struct {
 		desc                     string

test/integration/apiserver/admissionwebhook/match_conditions_test.go

@@ -22,7 +22,6 @@ import (
 	"crypto/x509"
 	"encoding/json"
 	"io"
-	"k8s.io/apimachinery/pkg/util/version"
 	"net/http"
 	"net/http/httptest"
 	"strconv"
@@ -634,9 +633,9 @@ func TestMatchConditionsWithoutStrictCostEnforcement(t *testing.T) {
 	for _, testcase := range testcases {
 		t.Run(testcase.name, func(t *testing.T) {
 			upCh := recorder.Reset()
-			featuregatetesting.SetFeatureGateEmulationVersionDuringTest(t, utilfeature.DefaultFeatureGate, version.MustParse("1.31"))
+			server, err := apiservertesting.StartTestServer(t, nil, []string{
-			featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, genericfeatures.StrictCostEnforcementForWebhooks, false)
+				"--emulated-version", "1.31",
-			server, err := apiservertesting.StartTestServer(t, &apiservertesting.TestServerInstanceOptions{EmulationVersion: "1.31"}, []string{
+				"--feature-gates", "StrictCostEnforcementForWebhooks=false",
 				"--disable-admission-plugins=ServiceAccount",
 			}, framework.SharedEtcd())
 			if err != nil {

test/integration/apiserver/apiserver_test.go

@@ -56,10 +56,12 @@ import (
 	"k8s.io/apimachinery/pkg/types"
 	utiljson "k8s.io/apimachinery/pkg/util/json"
 	"k8s.io/apimachinery/pkg/util/uuid"
+	"k8s.io/apimachinery/pkg/util/version"
 	"k8s.io/apimachinery/pkg/util/wait"
 	"k8s.io/apimachinery/pkg/watch"
 	"k8s.io/apiserver/pkg/endpoints/handlers"
 	"k8s.io/apiserver/pkg/storage/storagebackend"
+	"k8s.io/apiserver/pkg/util/compatibility"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
 	"k8s.io/client-go/discovery/cached/memory"
 	"k8s.io/client-go/dynamic"
@@ -70,7 +72,6 @@ import (
 	"k8s.io/client-go/restmapper"
 	"k8s.io/client-go/tools/pager"
 	featuregatetesting "k8s.io/component-base/featuregate/testing"
-	utilversion "k8s.io/component-base/version"
 	"k8s.io/klog/v2"
 	"k8s.io/kubernetes/cmd/kube-apiserver/app/options"
 	kubeapiservertesting "k8s.io/kubernetes/cmd/kube-apiserver/app/testing"
@@ -3198,8 +3199,7 @@ func TestEmulatedStorageVersion(t *testing.T) {
 	for emulatedVersion, cases := range groupedCases {
 		t.Run(emulatedVersion, func(t *testing.T) {
 			server := kubeapiservertesting.StartTestServerOrDie(
-				t, &kubeapiservertesting.TestServerInstanceOptions{BinaryVersion: emulatedVersion},
+				t, nil, []string{"--emulated-version=kube=" + emulatedVersion, `--storage-media-type=application/json`}, framework.SharedEtcd())
-				[]string{"--emulated-version=kube=" + emulatedVersion, `--storage-media-type=application/json`}, framework.SharedEtcd())
 			defer server.TearDownFn()
 
 			client := clientset.NewForConfigOrDie(server.ClientConfig)
@@ -3302,7 +3302,7 @@ func TestAllowedEmulationVersions(t *testing.T) {
 	}{
 		{
 			name:             "default",
-			emulationVersion: utilversion.DefaultKubeEffectiveVersion().EmulationVersion().String(),
+			emulationVersion: compatibility.DefaultKubeEffectiveVersionForTest().EmulationVersion().String(),
 		},
 	}
 
@@ -3337,6 +3337,7 @@ func TestAllowedEmulationVersions(t *testing.T) {
 }
 
 func TestEnableEmulationVersion(t *testing.T) {
+	featuregatetesting.SetFeatureGateEmulationVersionDuringTest(t, utilfeature.DefaultFeatureGate, version.MustParse("1.32"))
 	server := kubeapiservertesting.StartTestServerOrDie(t,
 		&kubeapiservertesting.TestServerInstanceOptions{BinaryVersion: "1.32"},
 		[]string{"--emulated-version=kube=1.31"}, framework.SharedEtcd())
@@ -3398,6 +3399,7 @@ func TestEnableEmulationVersion(t *testing.T) {
 }
 
 func TestDisableEmulationVersion(t *testing.T) {
+	featuregatetesting.SetFeatureGateEmulationVersionDuringTest(t, utilfeature.DefaultFeatureGate, version.MustParse("1.32"))
 	server := kubeapiservertesting.StartTestServerOrDie(t,
 		&kubeapiservertesting.TestServerInstanceOptions{BinaryVersion: "1.32"},
 		[]string{}, framework.SharedEtcd())

test/integration/apiserver/cel/validatingadmissionpolicy_test.go

@@ -20,7 +20,6 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"k8s.io/apimachinery/pkg/util/version"
 	"net/http"
 	"net/http/httptest"
 	"os"
@@ -2235,9 +2234,9 @@ func Test_CostLimitForValidation(t *testing.T) {
 func Test_CostLimitForValidationWithFeatureDisabled(t *testing.T) {
 	resetPolicyRefreshInterval := generic.SetPolicyRefreshIntervalForTests(policyRefreshInterval)
 	defer resetPolicyRefreshInterval()
-	featuregatetesting.SetFeatureGateEmulationVersionDuringTest(t, utilfeature.DefaultFeatureGate, version.MustParse("1.31"))
+	server, err := apiservertesting.StartTestServer(t, nil, []string{
-	featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, genericfeatures.StrictCostEnforcementForVAP, false)
+		"--emulated-version", "1.31",
-	server, err := apiservertesting.StartTestServer(t, &apiservertesting.TestServerInstanceOptions{EmulationVersion: "1.31"}, []string{
+		"--feature-gates", "StrictCostEnforcementForVAP=false",
 		"--enable-admission-plugins", "ValidatingAdmissionPolicy",
 	}, framework.SharedEtcd())
 	if err != nil {

test/integration/client/client_test.go

@@ -47,6 +47,7 @@ import (
 	"k8s.io/apimachinery/pkg/util/wait"
 	"k8s.io/apimachinery/pkg/watch"
 	"k8s.io/apiserver/pkg/features"
+	"k8s.io/apiserver/pkg/util/compatibility"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
 	appsv1ac "k8s.io/client-go/applyconfigurations/apps/v1"
 	autoscalingv1ac "k8s.io/client-go/applyconfigurations/autoscaling/v1"
@@ -83,7 +84,7 @@ func TestClient(t *testing.T) {
 		t.Fatalf("unexpected error: %v", err)
 	}
 	expectedInfo := utilversion.Get()
-	kubeVersion := utilversion.DefaultKubeEffectiveVersion().BinaryVersion()
+	kubeVersion := compatibility.DefaultKubeEffectiveVersionForTest().BinaryVersion()
 	expectedInfo.Major = fmt.Sprintf("%d", kubeVersion.Major())
 	expectedInfo.Minor = fmt.Sprintf("%d", kubeVersion.Minor())
 

test/integration/controlplane/transformation/transformation_test.go

@@ -25,7 +25,6 @@ import (
 	"path/filepath"
 	"strconv"
 	"strings"
-	"sync"
 	"testing"
 	"time"
 
@@ -117,7 +116,7 @@ func newTransformTest(tb testing.TB, transformerConfigYAML string, reload bool,
 		return nil, fmt.Errorf("failed to read config file: %w", err)
 	}
 
-	if e.kubeAPIServer, err = startTestServerLocked(
+	if e.kubeAPIServer, err = kubeapiservertesting.StartTestServer(
 		tb, nil,
 		e.getEncryptionOptions(reload), e.storageConfig); err != nil {
 		e.cleanUp()
@@ -148,15 +147,6 @@ func newTransformTest(tb testing.TB, transformerConfigYAML string, reload bool,
 	return &e, nil
 }
 
-var startTestServerLock sync.Mutex
-
-// startTestServerLocked prevents parallel calls to kubeapiservertesting.StartTestServer because it messes with global state.
-func startTestServerLocked(t ktesting.TB, instanceOptions *kubeapiservertesting.TestServerInstanceOptions, customFlags []string, storageConfig *storagebackend.Config) (result kubeapiservertesting.TestServer, err error) {
-	startTestServerLock.Lock()
-	defer startTestServerLock.Unlock()
-	return kubeapiservertesting.StartTestServer(t, instanceOptions, customFlags, storageConfig)
-}
-
 func (e *transformTest) cleanUp() {
 	if e.configDir != "" {
 		os.RemoveAll(e.configDir)

test/integration/etcd/data.go

@@ -25,6 +25,7 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 	"k8s.io/apimachinery/pkg/util/version"
+	"k8s.io/apiserver/pkg/util/compatibility"
 	utilversion "k8s.io/component-base/version"
 
 	"k8s.io/kubernetes/test/utils/image"
@@ -34,9 +35,9 @@ import (
 // Tests aiming for full coverage of versions should test fixtures of all supported versions.
 func GetSupportedEmulatedVersions() []string {
 	return []string{
-		utilversion.DefaultKubeEffectiveVersion().BinaryVersion().SubtractMinor(2).String(),
+		compatibility.DefaultKubeEffectiveVersionForTest().BinaryVersion().SubtractMinor(2).String(),
-		utilversion.DefaultKubeEffectiveVersion().BinaryVersion().SubtractMinor(1).String(),
+		compatibility.DefaultKubeEffectiveVersionForTest().BinaryVersion().SubtractMinor(1).String(),
-		utilversion.DefaultKubeEffectiveVersion().BinaryVersion().String(),
+		compatibility.DefaultKubeEffectiveVersionForTest().BinaryVersion().String(),
 	}
 }
 

test/integration/etcd/etcd_storage_path_test.go

@@ -104,7 +104,6 @@ func testEtcdStoragePathWithVersion(t *testing.T, v string) {
 		// only understand v1beta1.
 		featuregatetesting.SetFeatureGateDuringTest(t, feature.DefaultFeatureGate, features.MultiCIDRServiceAllocator, false)
 	}
-	registerEffectiveEmulationVersion(t)
 
 	apiServer := StartRealAPIServerOrDie(t, func(opts *options.ServerRunOptions) {
 		// Disable alphas when emulating previous versions.

test/integration/etcd/server.go

@@ -36,9 +36,9 @@ import (
 	"k8s.io/apimachinery/pkg/runtime/schema"
 	utilerrors "k8s.io/apimachinery/pkg/util/errors"
 	"k8s.io/apimachinery/pkg/util/json"
-	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
 	"k8s.io/apimachinery/pkg/util/wait"
 	genericapiserveroptions "k8s.io/apiserver/pkg/server/options"
+	"k8s.io/apiserver/pkg/util/compatibility"
 	"k8s.io/apiserver/pkg/util/feature"
 	cacheddiscovery "k8s.io/client-go/discovery/cached/memory"
 	"k8s.io/client-go/dynamic"
@@ -46,9 +46,8 @@ import (
 	restclient "k8s.io/client-go/rest"
 	"k8s.io/client-go/restmapper"
 	utiltesting "k8s.io/client-go/util/testing"
-	"k8s.io/component-base/featuregate"
+	basecompatibility "k8s.io/component-base/compatibility"
 	featuregatetesting "k8s.io/component-base/featuregate/testing"
-	utilversion "k8s.io/component-base/version"
 	"k8s.io/kubernetes/cmd/kube-apiserver/app"
 	"k8s.io/kubernetes/cmd/kube-apiserver/app/options"
 	"k8s.io/kubernetes/test/integration"
@@ -67,17 +66,6 @@ AwEHoUQDQgAEH6cuzP8XuD5wal6wf9M6xDljTOPLX2i8uIp/C/ASqiIGUeeKQtX0
 /IR3qCXyThP/dbCiHrF3v1cuhBOHY8CLVg==
 -----END EC PRIVATE KEY-----`
 
-func registerEffectiveEmulationVersion(t *testing.T) {
-	featureGate := feature.DefaultMutableFeatureGate
-	featureGate.AddMetrics()
-
-	effectiveVersion := utilversion.DefaultKubeEffectiveVersion()
-	effectiveVersion.SetEmulationVersion(featureGate.EmulationVersion())
-	featuregatetesting.SetFeatureGateEmulationVersionDuringTest(t, featureGate, effectiveVersion.EmulationVersion())
-	featuregate.DefaultComponentGlobalsRegistry.Reset()
-	utilruntime.Must(featuregate.DefaultComponentGlobalsRegistry.Register(featuregate.DefaultKubeComponent, effectiveVersion, featureGate))
-}
-
 // StartRealAPIServerOrDie starts an API server that is appropriate for use in tests that require one of every resource
 func StartRealAPIServerOrDie(t *testing.T, configFuncs ...func(*options.ServerRunOptions)) *APIServer {
 	tCtx := ktesting.Init(t)
@@ -108,6 +96,17 @@ func StartRealAPIServerOrDie(t *testing.T, configFuncs ...func(*options.ServerRu
 	}
 
 	opts := options.NewServerRunOptions()
+	// If EmulationVersion of DefaultFeatureGate is set during test, we need to propagate it to the apiserver ComponentGlobalsRegistry.
+	featureGate := feature.DefaultMutableFeatureGate.DeepCopy()
+	effectiveVersion := compatibility.DefaultKubeEffectiveVersionForTest()
+	effectiveVersion.SetEmulationVersion(featureGate.EmulationVersion())
+	// set up new instance of ComponentGlobalsRegistry instead of using the DefaultComponentGlobalsRegistry to avoid contention in parallel tests.
+	componentGlobalsRegistry := basecompatibility.NewComponentGlobalsRegistry()
+	if err := componentGlobalsRegistry.Register(basecompatibility.DefaultKubeComponent, effectiveVersion, featureGate); err != nil {
+		t.Fatal(err)
+	}
+	opts.GenericServerRunOptions.ComponentGlobalsRegistry = componentGlobalsRegistry
+
 	opts.Options.SecureServing.Listener = listener
 	opts.Options.SecureServing.ServerCert.CertDirectory = certDir
 	opts.Options.ServiceAccountSigningKeyFile = saSigningKeyFile.Name()
@@ -123,6 +122,19 @@ func StartRealAPIServerOrDie(t *testing.T, configFuncs ...func(*options.ServerRu
 	for _, f := range configFuncs {
 		f(opts)
 	}
+
+	// If the local ComponentGlobalsRegistry is changed by configFuncs,
+	// we need to copy the new feature values back to the DefaultFeatureGate because most feature checks still use the DefaultFeatureGate.
+	if !featureGate.EmulationVersion().EqualTo(feature.DefaultMutableFeatureGate.EmulationVersion()) {
+		featuregatetesting.SetFeatureGateEmulationVersionDuringTest(t, feature.DefaultMutableFeatureGate, effectiveVersion.EmulationVersion())
+	}
+	for f := range feature.DefaultMutableFeatureGate.GetAll() {
+		if featureGate.Enabled(f) != feature.DefaultFeatureGate.Enabled(f) {
+			featuregatetesting.SetFeatureGateDuringTest(t, feature.DefaultFeatureGate, f, featureGate.Enabled(f))
+		}
+	}
+	feature.DefaultMutableFeatureGate.AddMetrics()
+
 	completedOptions, err := opts.Complete(tCtx)
 	if err != nil {
 		t.Fatal(err)

test/integration/examples/apiserver_test.go

@@ -55,9 +55,9 @@ import (
 	clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
 	"k8s.io/client-go/transport"
 	"k8s.io/client-go/util/cert"
+	basecompatibility "k8s.io/component-base/compatibility"
 	"k8s.io/component-base/featuregate"
 	featuregatetesting "k8s.io/component-base/featuregate/testing"
-	utilversion "k8s.io/component-base/version"
 	apiregistrationv1 "k8s.io/kube-aggregator/pkg/apis/apiregistration/v1"
 	aggregatorclient "k8s.io/kube-aggregator/pkg/client/clientset_generated/clientset"
 	"k8s.io/kubernetes/cmd/kube-apiserver/app"
@@ -282,11 +282,8 @@ func testFrontProxyConfig(t *testing.T, withUID bool) {
 		extraKASFlags = []string{"--requestheader-uid-headers=x-remote-uid"}
 	}
 
-	// each wardle binary is bundled with a specific kube binary.
-	kubeBinaryVersion := sampleserver.WardleVersionToKubeVersion(version.MustParse(wardleBinaryVersion)).String()
-
 	// start up the KAS and prepare the options for the wardle API server
-	testKAS, wardleOptions, wardlePort := prepareAggregatedWardleAPIServer(ctx, t, testNamespace, kubeBinaryVersion, wardleBinaryVersion, extraKASFlags, withUID)
+	testKAS, wardleOptions, wardlePort := prepareAggregatedWardleAPIServer(ctx, t, testNamespace, wardleBinaryVersion, extraKASFlags, withUID)
 	kubeConfig := getKubeConfig(testKAS)
 
 	// create the SA that we will use to query the aggregated API
@@ -402,10 +399,7 @@ func testAggregatedAPIServer(t *testing.T, setWardleFeatureGate, banFlunder bool
 	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Minute)
 	t.Cleanup(cancel)
 
-	// each wardle binary is bundled with a specific kube binary.
+	testKAS, wardleOptions, wardlePort := prepareAggregatedWardleAPIServer(ctx, t, testNamespace, wardleBinaryVersion, nil, false)
-	kubeBinaryVersion := sampleserver.WardleVersionToKubeVersion(version.MustParse(wardleBinaryVersion)).String()
-
-	testKAS, wardleOptions, wardlePort := prepareAggregatedWardleAPIServer(ctx, t, testNamespace, kubeBinaryVersion, wardleBinaryVersion, nil, false)
 	kubeClientConfig := getKubeConfig(testKAS)
 
 	wardleCertDir, _ := os.MkdirTemp("", "test-integration-wardle-server")
@@ -685,7 +679,7 @@ func TestAggregatedAPIServerRejectRedirectResponse(t *testing.T) {
 	}
 }
 
-func prepareAggregatedWardleAPIServer(ctx context.Context, t *testing.T, namespace, kubebinaryVersion, wardleBinaryVersion string, kubeAPIServerFlags []string, withUID bool) (*kastesting.TestServer, *sampleserver.WardleServerOptions, int) {
+func prepareAggregatedWardleAPIServer(ctx context.Context, t *testing.T, namespace, wardleBinaryVersion string, kubeAPIServerFlags []string, withUID bool) (*kastesting.TestServer, *sampleserver.WardleServerOptions, int) {
 	// makes the kube-apiserver very responsive.  it's normally a minute
 	dynamiccertificates.FileRefreshDuration = 1 * time.Second
 
@@ -697,22 +691,17 @@ func prepareAggregatedWardleAPIServer(ctx context.Context, t *testing.T, namespa
 	// endpoints cannot have loopback IPs so we need to override the resolver itself
 	t.Cleanup(app.SetServiceResolverForTests(staticURLServiceResolver(fmt.Sprintf("https://127.0.0.1:%d", wardlePort))))
 
-	// TODO figure out how to actually make BinaryVersion/EmulationVersion work with Wardle and KAS at the same time when Alpha FG are being set
-	if withUID {
-		kubebinaryVersion = ""
-	}
-
 	testServer := kastesting.StartTestServerOrDie(t,
 		&kastesting.TestServerInstanceOptions{
 			EnableCertAuth: true,
-			BinaryVersion:  kubebinaryVersion,
 		},
 		kubeAPIServerFlags,
 		framework.SharedEtcd())
 	t.Cleanup(func() { testServer.TearDownFn() })
 
-	_, _ = featuregate.DefaultComponentGlobalsRegistry.ComponentGlobalsOrRegister(
+	componentGlobalsRegistry := testServer.ServerOpts.Options.GenericServerRunOptions.ComponentGlobalsRegistry
-		apiserver.WardleComponentName, utilversion.NewEffectiveVersion(wardleBinaryVersion),
+	_, _ = componentGlobalsRegistry.ComponentGlobalsOrRegister(
+		apiserver.WardleComponentName, basecompatibility.NewEffectiveVersionFromString(wardleBinaryVersion, "", ""),
 		featuregate.NewVersionedFeatureGate(version.MustParse(wardleBinaryVersion)))
 
 	kubeClient := client.NewForConfigOrDie(getKubeConfig(testServer))
@@ -740,6 +729,7 @@ func prepareAggregatedWardleAPIServer(ctx context.Context, t *testing.T, namespa
 	}
 
 	wardleOptions := sampleserver.NewWardleServerOptions(os.Stdout, os.Stderr)
+	wardleOptions.ComponentGlobalsRegistry = componentGlobalsRegistry
 	// ensure this is a SAN on the generated cert for service FQDN
 	wardleOptions.AlternateDNS = []string{
 		fmt.Sprintf("api.%s.svc", namespace),

test/integration/framework/test_server.go

@@ -35,9 +35,13 @@ import (
 	"k8s.io/apimachinery/pkg/util/wait"
 	genericapiserver "k8s.io/apiserver/pkg/server"
 	genericapiserveroptions "k8s.io/apiserver/pkg/server/options"
+	"k8s.io/apiserver/pkg/util/compatibility"
+	utilfeature "k8s.io/apiserver/pkg/util/feature"
 	client "k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/rest"
 	"k8s.io/client-go/util/cert"
+	basecompatibility "k8s.io/component-base/compatibility"
+	featuregatetesting "k8s.io/component-base/featuregate/testing"
 	aggregatorscheme "k8s.io/kube-aggregator/pkg/apiserver/scheme"
 	netutils "k8s.io/utils/net"
 
@@ -136,6 +140,17 @@ func StartTestServer(ctx context.Context, t testing.TB, setup TestServerSetup) (
 	}
 
 	opts := options.NewServerRunOptions()
+	// If EmulationVersion of DefaultFeatureGate is set during test, we need to propagate it to the apiserver ComponentGlobalsRegistry.
+	featureGate := utilfeature.DefaultMutableFeatureGate.DeepCopy()
+	effectiveVersion := compatibility.DefaultKubeEffectiveVersionForTest()
+	effectiveVersion.SetEmulationVersion(featureGate.EmulationVersion())
+	// set up new instance of ComponentGlobalsRegistry instead of using the DefaultComponentGlobalsRegistry to avoid contention in parallel tests.
+	componentGlobalsRegistry := basecompatibility.NewComponentGlobalsRegistry()
+	if err := componentGlobalsRegistry.Register(basecompatibility.DefaultKubeComponent, effectiveVersion, featureGate); err != nil {
+		t.Fatal(err)
+	}
+	opts.GenericServerRunOptions.ComponentGlobalsRegistry = componentGlobalsRegistry
+
 	opts.SecureServing.Listener = listener
 	opts.SecureServing.BindAddress = netutils.ParseIPSloppy("127.0.0.1")
 	opts.SecureServing.ServerCert.CertDirectory = certDir
@@ -158,6 +173,18 @@ func StartTestServer(ctx context.Context, t testing.TB, setup TestServerSetup) (
 		setup.ModifyServerRunOptions(opts)
 	}
 
+	// If the local ComponentGlobalsRegistry is changed by ModifyServerRunOptions,
+	// we need to copy the new feature values back to the DefaultFeatureGate because most feature checks still use the DefaultFeatureGate.
+	if !featureGate.EmulationVersion().EqualTo(utilfeature.DefaultMutableFeatureGate.EmulationVersion()) {
+		featuregatetesting.SetFeatureGateEmulationVersionDuringTest(t, utilfeature.DefaultMutableFeatureGate, effectiveVersion.EmulationVersion())
+	}
+	for f := range utilfeature.DefaultMutableFeatureGate.GetAll() {
+		if featureGate.Enabled(f) != utilfeature.DefaultFeatureGate.Enabled(f) {
+			featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, f, featureGate.Enabled(f))
+		}
+	}
+	utilfeature.DefaultMutableFeatureGate.AddMetrics()
+
 	completedOptions, err := opts.Complete(ctx)
 	if err != nil {
 		t.Fatal(err)

test/integration/pods/pods_test.go

@@ -1230,9 +1230,8 @@ func TestMutablePodSchedulingDirectives(t *testing.T) {
 // Test disabling of RelaxedDNSSearchValidation after a Pod has been created
 func TestRelaxedDNSSearchValidation(t *testing.T) {
 	// Disable ServiceAccount admission plugin as we don't have serviceaccount controller running.
-	server := kubeapiservertesting.StartTestServerOrDie(t,
+	server := kubeapiservertesting.StartTestServerOrDie(t, nil,
-		&kubeapiservertesting.TestServerInstanceOptions{BinaryVersion: "1.32"},
+		append(framework.DefaultTestServerFlags(), "--emulated-version=1.32"), framework.SharedEtcd())
-		framework.DefaultTestServerFlags(), framework.SharedEtcd())
 	defer server.TearDownFn()
 
 	client := clientset.NewForConfigOrDie(server.ClientConfig)

test/integration/service/loadbalancer_test.go

@@ -19,7 +19,7 @@ package service
 import (
 	"context"
 	"encoding/json"
-	"k8s.io/apimachinery/pkg/util/version"
+	"fmt"
 	"testing"
 	"time"
 
@@ -34,10 +34,8 @@ import (
 	clientset "k8s.io/client-go/kubernetes"
 	servicecontroller "k8s.io/cloud-provider/controllers/service"
 	fakecloud "k8s.io/cloud-provider/fake"
-	featuregatetesting "k8s.io/component-base/featuregate/testing"
 	controllersmetrics "k8s.io/component-base/metrics/prometheus/controllers"
 	kubeapiservertesting "k8s.io/kubernetes/cmd/kube-apiserver/app/testing"
-	"k8s.io/kubernetes/pkg/features"
 	"k8s.io/kubernetes/test/integration/framework"
 	"k8s.io/utils/net"
 	utilpointer "k8s.io/utils/pointer"
@@ -708,13 +706,12 @@ func Test_ServiceLoadBalancerIPMode(t *testing.T) {
 
 	for _, tc := range testCases {
 		t.Run("", func(t *testing.T) {
-			var testServerOptions *kubeapiservertesting.TestServerInstanceOptions
+			serverFlags := framework.DefaultTestServerFlags()
 			if !tc.ipModeEnabled {
-				testServerOptions = &kubeapiservertesting.TestServerInstanceOptions{EmulationVersion: "1.31"}
+				serverFlags = append(serverFlags, "--emulated-version=1.31")
-				featuregatetesting.SetFeatureGateEmulationVersionDuringTest(t, utilfeature.DefaultFeatureGate, version.MustParse("1.31"))
 			}
-			featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.LoadBalancerIPMode, tc.ipModeEnabled)
+			serverFlags = append(serverFlags, fmt.Sprintf("--feature-gates=LoadBalancerIPMode=%v", tc.ipModeEnabled))
-			server := kubeapiservertesting.StartTestServerOrDie(t, testServerOptions, framework.DefaultTestServerFlags(), framework.SharedEtcd())
+			server := kubeapiservertesting.StartTestServerOrDie(t, nil, serverFlags, framework.SharedEtcd())
 			defer server.TearDownFn()
 
 			client, err := clientset.NewForConfig(server.ClientConfig)