Add a tool for grabbing and parsing prometheus metrics

pkg/metrics/api_server_metrics.go

@@ -0,0 +1,77 @@
+/*
+Copyright 2015 The Kubernetes Authors All rights reserved.
+
+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 metrics
+
+import (
+	"k8s.io/kubernetes/pkg/util/sets"
+
+	"github.com/prometheus/common/model"
+)
+
+var KnownApiServerMetrics = map[string][]string{
+	"apiserver_request_count":                        {"verb", "resource", "client", "code"},
+	"apiserver_request_latencies_bucket":             {"verb", "resource", "le"},
+	"apiserver_request_latencies_count":              {"verb", "resource"},
+	"apiserver_request_latencies_sum":                {"verb", "resource"},
+	"apiserver_request_latencies_summary":            {"verb", "resource", "quantile"},
+	"apiserver_request_latencies_summary_count":      {"verb", "resource"},
+	"apiserver_request_latencies_summary_sum":        {"verb", "resource"},
+	"etcd_helper_cache_entry_count":                  {},
+	"etcd_helper_cache_hit_count":                    {},
+	"etcd_helper_cache_miss_count":                   {},
+	"etcd_request_cache_add_latencies_summary":       {"quantile"},
+	"etcd_request_cache_add_latencies_summary_count": {},
+	"etcd_request_cache_add_latencies_summary_sum":   {},
+	"etcd_request_cache_get_latencies_summary":       {"quantile"},
+	"etcd_request_cache_get_latencies_summary_count": {},
+	"etcd_request_cache_get_latencies_summary_sum":   {},
+	"etcd_request_latencies_summary":                 {"operation", "type", "quantile"},
+	"etcd_request_latencies_summary_count":           {"operation", "type"},
+	"etcd_request_latencies_summary_sum":             {"operation", "type"},
+	"get_token_count":                                {},
+	"get_token_fail_count":                           {},
+	"rest_client_request_latency_microseconds":       {"url", "verb", "quantile"},
+	"rest_client_request_latency_microseconds_count": {"url", "verb"},
+	"rest_client_request_latency_microseconds_sum":   {"url", "verb"},
+	"rest_client_request_status_codes":               {"code", "host", "method"},
+}
+
+type ApiServerMetrics Metrics
+
+func NewApiServerMetrics() ApiServerMetrics {
+	result := NewMetrics()
+	for metric := range KnownApiServerMetrics {
+		result[metric] = make(model.Samples, 0)
+	}
+	return ApiServerMetrics(result)
+}
+
+func parseApiServerMetrics(data string, unknownMetrics sets.String) (ApiServerMetrics, error) {
+	result := NewApiServerMetrics()
+	if err := parseMetrics(data, KnownApiServerMetrics, (*Metrics)(&result), unknownMetrics); err != nil {
+		return ApiServerMetrics{}, err
+	}
+	return result, nil
+}
+
+func (g *MetricsGrabber) getMetricsFromApiServer() (string, error) {
+	rawOutput, err := g.client.Get().RequestURI("/metrics").Do().Raw()
+	if err != nil {
+		return "", err
+	}
+	return string(rawOutput), nil
+}

pkg/metrics/controller_manager_metrics.go

@@ -0,0 +1,59 @@
+/*
+Copyright 2015 The Kubernetes Authors All rights reserved.
+
+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 metrics
+
+import (
+	"k8s.io/kubernetes/pkg/util/sets"
+
+	"github.com/prometheus/common/model"
+)
+
+var KnownControllerManagerMetrics = map[string][]string{
+	"etcd_helper_cache_entry_count":                  {},
+	"etcd_helper_cache_hit_count":                    {},
+	"etcd_helper_cache_miss_count":                   {},
+	"etcd_request_cache_add_latencies_summary":       {"quantile"},
+	"etcd_request_cache_add_latencies_summary_count": {},
+	"etcd_request_cache_add_latencies_summary_sum":   {},
+	"etcd_request_cache_get_latencies_summary":       {"quantile"},
+	"etcd_request_cache_get_latencies_summary_count": {},
+	"etcd_request_cache_get_latencies_summary_sum":   {},
+	"get_token_count":                                {},
+	"get_token_fail_count":                           {},
+	"rest_client_request_latency_microseconds":       {"url", "verb", "quantile"},
+	"rest_client_request_latency_microseconds_count": {"url", "verb"},
+	"rest_client_request_latency_microseconds_sum":   {"url", "verb"},
+	"rest_client_request_status_codes":               {"method", "code", "host"},
+}
+
+type ControllerManagerMetrics Metrics
+
+func NewControllerManagerMetrics() ControllerManagerMetrics {
+	result := NewMetrics()
+	for metric := range KnownControllerManagerMetrics {
+		result[metric] = make(model.Samples, 0)
+	}
+	return ControllerManagerMetrics(result)
+}
+
+func parseControllerManagerMetrics(data string, unknownMetrics sets.String) (ControllerManagerMetrics, error) {
+	result := NewControllerManagerMetrics()
+	if err := parseMetrics(data, KnownControllerManagerMetrics, (*Metrics)(&result), unknownMetrics); err != nil {
+		return ControllerManagerMetrics{}, err
+	}
+	return result, nil
+}

pkg/metrics/generic_metrics.go

@@ -0,0 +1,119 @@
+/*
+Copyright 2015 The Kubernetes Authors All rights reserved.
+
+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 metrics
+
+import (
+	"fmt"
+	"io"
+	"strings"
+
+	"k8s.io/kubernetes/pkg/util/sets"
+
+	"github.com/golang/glog"
+	"github.com/prometheus/common/expfmt"
+	"github.com/prometheus/common/model"
+)
+
+var CommonMetrics = map[string][]string{
+	"process_start_time_seconds":    {},
+	"process_resident_memory_bytes": {},
+	"process_virtual_memory_bytes":  {},
+	"process_cpu_seconds_total":     {},
+	"process_max_fds":               {},
+	"process_open_fds":              {},
+
+	"http_request_size_bytes":                  {"handler", "quantile"},
+	"http_request_size_bytes_count":            {"handler"},
+	"http_request_size_bytes_sum":              {"handler"},
+	"http_request_duration_microseconds":       {"handler", "quantile"},
+	"http_request_duration_microseconds_count": {"handler"},
+	"http_request_duration_microseconds_sum":   {"handler"},
+	"http_requests_total":                      {"handler", "method", "code"},
+
+	"http_response_size_bytes":       {"handler", "quantile"},
+	"http_response_size_bytes_count": {"handler"},
+	"http_response_size_bytes_sum":   {"handler"},
+
+	"ssh_tunnel_open_fail_count": {},
+	"ssh_tunnel_open_count":      {},
+
+	"go_gc_duration_seconds":       {"quantile"},
+	"go_gc_duration_seconds_count": {},
+	"go_gc_duration_seconds_sum":   {},
+	"go_goroutines":                {},
+
+	"kubernetes_build_info": {"major", "minor", "gitCommit", "gitTreeState", "gitVersion"},
+}
+
+type Metrics map[string]model.Samples
+
+func NewMetrics() Metrics {
+	result := make(Metrics)
+	for metric := range CommonMetrics {
+		result[metric] = make(model.Samples, 0)
+	}
+	return result
+}
+
+func parseMetrics(data string, knownMetrics map[string][]string, output *Metrics, unknownMetrics sets.String) error {
+	dec, err := expfmt.NewDecoder(strings.NewReader(data), expfmt.FmtText)
+	if err != nil {
+		return err
+	}
+	decoder := expfmt.SampleDecoder{
+		Dec:  dec,
+		Opts: &expfmt.DecodeOptions{},
+	}
+
+	for {
+		var v model.Vector
+		if err = decoder.Decode(&v); err != nil {
+			if err == io.EOF {
+				// Expected loop termination condition.
+				return nil
+			}
+			glog.Warningf("Invalid Decode. Skipping.")
+			continue
+		}
+		for _, metric := range v {
+			name := string(metric.Metric[model.MetricNameLabel])
+			_, isCommonMetric := CommonMetrics[name]
+			_, isKnownMetric := knownMetrics[name]
+			if isKnownMetric || isCommonMetric {
+				(*output)[name] = append((*output)[name], metric)
+			} else {
+				glog.Warning("Unknown metric %v", metric)
+				unknownMetrics.Insert(name)
+			}
+		}
+	}
+	return nil
+}
+
+func (g *MetricsGrabber) getMetricsFromPod(podName string, namespace string, port int) (string, error) {
+	rawOutput, err := g.client.Get().
+		Prefix("proxy").
+		Namespace(namespace).
+		Resource("pods").
+		Name(fmt.Sprintf("%v:%v", podName, port)).
+		Suffix("metrics").
+		Do().Raw()
+	if err != nil {
+		return "", err
+	}
+	return string(rawOutput), nil
+}

pkg/metrics/kubelet_metrics.go

@@ -0,0 +1,130 @@
+/*
+Copyright 2015 The Kubernetes Authors All rights reserved.
+
+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 metrics
+
+import (
+	"fmt"
+
+	"k8s.io/kubernetes/pkg/util/sets"
+
+	"github.com/prometheus/common/model"
+)
+
+var KnownKubeletMetrics = map[string][]string{
+	"cadvisor_version_info":                                  {"cadvisorRevision", "cadvisorVersion", "dockerVersion", "kernelVersion", "osVersion"},
+	"container_cpu_system_seconds_total":                     {"id", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_cpu_usage_seconds_total":                      {"id", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name", "cpu"},
+	"container_cpu_user_seconds_total":                       {"id", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_fs_io_current":                                {"device", "id", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_fs_io_time_seconds_total":                     {"device", "id", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_fs_io_time_weighted_seconds_total":            {"device", "id", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_fs_limit_bytes":                               {"device", "id", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_fs_read_seconds_total":                        {"device", "id", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_fs_reads_merged_total":                        {"device", "id", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_fs_reads_total":                               {"device", "id", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_fs_sector_reads_total":                        {"device", "id", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_fs_sector_writes_total":                       {"device", "id", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_fs_usage_bytes":                               {"device", "id", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_fs_write_seconds_total":                       {"device", "id", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_fs_writes_merged_total":                       {"device", "id", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_fs_writes_total":                              {"device", "id", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_last_seen":                                    {"id", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_memory_failcnt":                               {"id", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_memory_failures_total":                        {"id", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name", "scope", "type"},
+	"container_memory_usage_bytes":                           {"id", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_memory_working_set_bytes":                     {"id", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_network_receive_bytes_total":                  {"id", "interface", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_network_receive_errors_total":                 {"id", "image", "interface", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_network_receive_packets_dropped_total":        {"id", "image", "interface", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_network_receive_packets_total":                {"id", "image", "interface", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_network_transmit_bytes_total":                 {"id", "interface", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_network_transmit_errors_total":                {"id", "interface", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_network_transmit_packets_dropped_total":       {"id", "interface", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_network_transmit_packets_total":               {"id", "interface", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_scrape_error":                                 {},
+	"container_spec_cpu_shares":                              {"id", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_spec_memory_limit_bytes":                      {"id", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_spec_memory_swap_limit_bytes":                 {"id", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_start_time_seconds":                           {"id", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name"},
+	"container_tasks_state":                                  {"id", "image", "kubernetes_container_name", "kubernetes_namespace", "kubernetes_pod_name", "name", "state"},
+	"get_token_count":                                        {},
+	"get_token_fail_count":                                   {},
+	"kubelet_container_manager_latency_microseconds":         {"operation_type", "quantile"},
+	"kubelet_container_manager_latency_microseconds_count":   {"operation_type"},
+	"kubelet_container_manager_latency_microseconds_sum":     {"operation_type"},
+	"kubelet_containers_per_pod_count":                       {"quantile"},
+	"kubelet_containers_per_pod_count_count":                 {},
+	"kubelet_containers_per_pod_count_sum":                   {},
+	"kubelet_docker_errors":                                  {"operation_type"},
+	"kubelet_docker_operations_latency_microseconds":         {"operation_type", "quantile"},
+	"kubelet_docker_operations_latency_microseconds_count":   {"operation_type"},
+	"kubelet_docker_operations_latency_microseconds_sum":     {"operation_type"},
+	"kubelet_generate_pod_status_latency_microseconds":       {"quantile"},
+	"kubelet_generate_pod_status_latency_microseconds_count": {},
+	"kubelet_generate_pod_status_latency_microseconds_sum":   {},
+	"kubelet_pod_start_latency_microseconds":                 {"quantile"},
+	"kubelet_pod_start_latency_microseconds_count":           {},
+	"kubelet_pod_start_latency_microseconds_sum":             {},
+	"kubelet_pod_worker_latency_microseconds":                {"operation_type", "quantile"},
+	"kubelet_pod_worker_latency_microseconds_count":          {"operation_type"},
+	"kubelet_pod_worker_latency_microseconds_sum":            {"operation_type"},
+	"kubelet_pod_worker_start_latency_microseconds":          {"quantile"},
+	"kubelet_pod_worker_start_latency_microseconds_count":    {},
+	"kubelet_pod_worker_start_latency_microseconds_sum":      {},
+	"kubelet_running_container_count":                        {},
+	"kubelet_running_pod_count":                              {},
+	"kubelet_sync_pods_latency_microseconds":                 {"quantile"},
+	"kubelet_sync_pods_latency_microseconds_count":           {},
+	"kubelet_sync_pods_latency_microseconds_sum":             {},
+	"machine_cpu_cores":                                      {},
+	"machine_memory_bytes":                                   {},
+	"rest_client_request_latency_microseconds":               {"quantile", "url", "verb"},
+	"rest_client_request_latency_microseconds_count":         {"url", "verb"},
+	"rest_client_request_latency_microseconds_sum":           {"url", "verb"},
+	"rest_client_request_status_codes":                       {"code", "host", "method"},
+}
+
+type KubeletMetrics Metrics
+
+func NewKubeletMetrics() KubeletMetrics {
+	result := NewMetrics()
+	for metric := range KnownKubeletMetrics {
+		result[metric] = make(model.Samples, 0)
+	}
+	return KubeletMetrics(result)
+}
+
+func parseKubeletMetrics(data string, unknownMetrics sets.String) (KubeletMetrics, error) {
+	result := NewKubeletMetrics()
+	if err := parseMetrics(data, KnownKubeletMetrics, (*Metrics)(&result), unknownMetrics); err != nil {
+		return KubeletMetrics{}, err
+	}
+	return result, nil
+}
+
+func (g *MetricsGrabber) getMetricsFromNode(nodeName string) (string, error) {
+	rawOutput, err := g.client.Get().
+		Prefix("proxy").
+		Resource("nodes").
+		Name(fmt.Sprintf("%v:%v", nodeName, g.kubeletPort)).
+		Suffix("metrics").
+		Do().Raw()
+	if err != nil {
+		return "", err
+	}
+	return string(rawOutput), nil
+}

pkg/metrics/metrics_grabber.go

@@ -0,0 +1,136 @@
+/*
+Copyright 2015 The Kubernetes Authors All rights reserved.
+
+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 metrics
+
+import (
+	"fmt"
+	"strings"
+
+	"k8s.io/kubernetes/pkg/api"
+	client "k8s.io/kubernetes/pkg/client/unversioned"
+	"k8s.io/kubernetes/pkg/master/ports"
+	"k8s.io/kubernetes/pkg/util/sets"
+
+	"github.com/golang/glog"
+)
+
+type MetricsCollection struct {
+	ApiServerMetrics         ApiServerMetrics
+	ControllerManagerMetrics ControllerManagerMetrics
+	KubeletMetrics           map[string]KubeletMetrics
+	SchedulerMetrics         SchedulerMetrics
+}
+
+type MetricsGrabber struct {
+	client                    *client.Client
+	grabFromApiServer         bool
+	grabFromControllerManager bool
+	grabFromKubelets          bool
+	grabFromScheduler         bool
+	kubeletPort               int
+	masterName                string
+	registeredMaster          bool
+}
+
+// TODO: find a better way of figuring out if given node is a registered master.
+func isMasterNode(node *api.Node) bool {
+	return strings.HasSuffix(node.Name, "master")
+}
+
+func NewMetricsGrabber(c *client.Client, kubelets bool, scheduler bool, controllers bool, apiServer bool) (*MetricsGrabber, error) {
+	kubeletPort := 0
+	registeredMaster := false
+	masterName := ""
+	nodeList, err := c.Nodes().List(api.ListOptions{})
+	if err != nil {
+		return nil, err
+	}
+	if len(nodeList.Items) < 1 {
+		glog.Warning("Can't find any Nodes in the API server to grab metrics from")
+	}
+	for _, node := range nodeList.Items {
+		if isMasterNode(&node) {
+			registeredMaster = true
+			masterName = node.Name
+		} else {
+			// We assume that all Kubelets run on the same port, except possibly Master's Kubelet.
+			// This will need to get change if assumption is prover wrong.
+			kubeletPort = node.Status.DaemonEndpoints.KubeletEndpoint.Port
+		}
+	}
+	if !registeredMaster {
+		scheduler = false
+		controllers = false
+		glog.Warningf("Master node is not registered. Grabbing metrics from Scheduler and ControllerManager is disabled.")
+	}
+
+	return &MetricsGrabber{
+		client:                    c,
+		grabFromApiServer:         apiServer,
+		grabFromControllerManager: controllers,
+		grabFromKubelets:          kubelets,
+		grabFromScheduler:         scheduler,
+		kubeletPort:               kubeletPort,
+		masterName:                masterName,
+		registeredMaster:          registeredMaster,
+	}, nil
+}
+
+func (g *MetricsGrabber) GrabFromKubelet(nodeName string, unknownMetrics sets.String) (KubeletMetrics, error) {
+	if g.kubeletPort == 0 {
+		return KubeletMetrics{}, fmt.Errorf("MetricsGrabber wasn't able to find Kubelet port during startup. Skipping Kubelet's metrics gathering.")
+	}
+	output, err := g.getMetricsFromNode(nodeName)
+	if err != nil {
+		return KubeletMetrics{}, err
+	}
+	return parseKubeletMetrics(output, unknownMetrics)
+}
+
+func (g *MetricsGrabber) GrabFromScheduler(unknownMetrics sets.String) (SchedulerMetrics, error) {
+	if !g.registeredMaster {
+		return SchedulerMetrics{}, fmt.Errorf("Master's Kubelet is not registered. Skipping Scheduler's metrics gathering.")
+	}
+	output, err := g.getMetricsFromPod(fmt.Sprintf("%v-%v", "kube-scheduler", g.masterName), api.NamespaceSystem, ports.SchedulerPort)
+	if err != nil {
+		return SchedulerMetrics{}, err
+	}
+	return parseSchedulerMetrics(output, unknownMetrics)
+}
+
+func (g *MetricsGrabber) GrabFromControllerManager(unknownMetrics sets.String) (ControllerManagerMetrics, error) {
+	if !g.registeredMaster {
+		return ControllerManagerMetrics{}, fmt.Errorf("Master's Kubelet is not registered. Skipping ControllerManager's metrics gathering.")
+	}
+	output, err := g.getMetricsFromPod(fmt.Sprintf("%v-%v", "kube-controller-manager", g.masterName), api.NamespaceSystem, ports.ControllerManagerPort)
+	if err != nil {
+		return ControllerManagerMetrics{}, err
+	}
+	return parseControllerManagerMetrics(output, unknownMetrics)
+}
+
+func (g *MetricsGrabber) GrabFromApiServer(unknownMetrics sets.String) (ApiServerMetrics, error) {
+	output, err := g.getMetricsFromApiServer()
+	if err != nil {
+		return ApiServerMetrics{}, nil
+	}
+	return parseApiServerMetrics(output, unknownMetrics)
+}
+
+func (g *MetricsGrabber) Grab(unknownMetrics sets.String) (MetricsCollection, error) {
+	return MetricsCollection{}, nil
+}

pkg/metrics/scheduler_metrics.go

@@ -0,0 +1,58 @@
+/*
+Copyright 2015 The Kubernetes Authors All rights reserved.
+
+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 metrics
+
+import (
+	"k8s.io/kubernetes/pkg/util/sets"
+
+	"github.com/prometheus/common/model"
+)
+
+var KnownSchedulerMetrics = map[string][]string{
+	"rest_client_request_latency_microseconds":                  {"url", "verb", "quantile"},
+	"rest_client_request_latency_microseconds_count":            {"url", "verb"},
+	"rest_client_request_latency_microseconds_sum":              {"url", "verb"},
+	"rest_client_request_status_codes":                          {"code", "host", "method"},
+	"scheduler_binding_latency_microseconds":                    {"quantile"},
+	"scheduler_binding_latency_microseconds_count":              {},
+	"scheduler_binding_latency_microseconds_sum":                {},
+	"scheduler_binding_ratelimiter_saturation":                  {},
+	"scheduler_e2e_scheduling_latency_microseconds":             {"quantile"},
+	"scheduler_e2e_scheduling_latency_microseconds_count":       {},
+	"scheduler_e2e_scheduling_latency_microseconds_sum":         {},
+	"scheduler_scheduling_algorithm_latency_microseconds":       {"quantile"},
+	"scheduler_scheduling_algorithm_latency_microseconds_count": {},
+	"scheduler_scheduling_algorithm_latency_microseconds_sum":   {},
+}
+
+type SchedulerMetrics Metrics
+
+func NewSchedulerMetrics() SchedulerMetrics {
+	result := NewMetrics()
+	for metric := range KnownSchedulerMetrics {
+		result[metric] = make(model.Samples, 0)
+	}
+	return SchedulerMetrics(result)
+}
+
+func parseSchedulerMetrics(data string, unknownMetrics sets.String) (SchedulerMetrics, error) {
+	result := NewSchedulerMetrics()
+	if err := parseMetrics(data, KnownSchedulerMetrics, (*Metrics)(&result), unknownMetrics); err != nil {
+		return SchedulerMetrics{}, err
+	}
+	return result, nil
+}

test/e2e/metrics_grabber_test.go

@@ -0,0 +1,153 @@
+/*
+Copyright 2015 The Kubernetes Authors All rights reserved.
+
+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 e2e
+
+import (
+	"strings"
+
+	"k8s.io/kubernetes/pkg/api"
+	client "k8s.io/kubernetes/pkg/client/unversioned"
+	"k8s.io/kubernetes/pkg/metrics"
+	"k8s.io/kubernetes/pkg/util/sets"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+// Missing = Assumed minus Observed, Invalid = Observed minus Assumed
+func validateLabelSet(labelSet map[string][]string, data metrics.Metrics, invalidLabels map[string]sets.String, missingLabels map[string]sets.String) {
+	for metric, labels := range labelSet {
+		vector, found := data[metric]
+		Expect(found).To(Equal(true))
+		if found && len(vector) > 0 {
+			for _, observation := range vector {
+				for label := range observation.Metric {
+					// We need to check if it's a known label for this metric.
+					// Omit Prometheus internal metrics.
+					if strings.HasPrefix(string(label), "__") {
+						continue
+					}
+					invalidLabel := true
+					for _, knownLabel := range labels {
+						if string(label) == knownLabel {
+							invalidLabel = false
+						}
+					}
+					if invalidLabel {
+						if _, ok := invalidLabels[metric]; !ok {
+							invalidLabels[metric] = sets.NewString()
+						}
+						invalidLabels[metric].Insert(string(label))
+					}
+				}
+			}
+		}
+	}
+}
+
+func checkMetrics(response metrics.Metrics, assumedMetrics map[string][]string) {
+	invalidLabels := make(map[string]sets.String)
+	unknownLabels := make(map[string]sets.String)
+	validateLabelSet(metrics.CommonMetrics, response, invalidLabels, unknownLabels)
+	validateLabelSet(assumedMetrics, response, invalidLabels, unknownLabels)
+
+	Expect(unknownLabels).To(BeEmpty())
+	Expect(invalidLabels).To(BeEmpty())
+}
+
+var _ = Describe("MetricsGrabber", func() {
+	framework := NewFramework("metrics-grabber")
+	var c *client.Client
+	var grabber *metrics.MetricsGrabber
+	BeforeEach(func() {
+		var err error
+		c = framework.Client
+		expectNoError(err)
+		grabber, err = metrics.NewMetricsGrabber(c, true, true, true, true)
+		expectNoError(err)
+	})
+
+	It("should grab all metrics from API server.", func() {
+		By("Connecting to /metrics endpoint")
+		unknownMetrics := sets.NewString()
+		response, err := grabber.GrabFromApiServer(unknownMetrics)
+		expectNoError(err)
+		Expect(unknownMetrics).To(BeEmpty())
+
+		checkMetrics(metrics.Metrics(response), metrics.KnownApiServerMetrics)
+	})
+
+	It("should grab all metrics from a Kubelet.", func() {
+		By("Connecting proxying to Node through the API server")
+		nodes := ListSchedulableNodesOrDie(c)
+		Expect(nodes.Items).NotTo(BeEmpty())
+		unknownMetrics := sets.NewString()
+		response, err := grabber.GrabFromKubelet(nodes.Items[0].Name, unknownMetrics)
+		expectNoError(err)
+		Expect(unknownMetrics).To(BeEmpty())
+
+		checkMetrics(metrics.Metrics(response), metrics.KnownKubeletMetrics)
+	})
+
+	It("should grab all metrics from a Scheduler.", func() {
+		By("Connecting proxying to Pod through the API server")
+		// Check if master Node is registered
+		nodes, err := c.Nodes().List(api.ListOptions{})
+		expectNoError(err)
+
+		var masterRegistered = false
+		for _, node := range nodes.Items {
+			if strings.HasSuffix(node.Name, "master") {
+				masterRegistered = true
+			}
+		}
+		if !masterRegistered {
+			Logf("Master is node registered. Skipping testing Scheduler metrics.")
+			return
+		}
+		unknownMetrics := sets.NewString()
+		response, err := grabber.GrabFromScheduler(unknownMetrics)
+		expectNoError(err)
+		Expect(unknownMetrics).To(BeEmpty())
+
+		checkMetrics(metrics.Metrics(response), metrics.KnownSchedulerMetrics)
+	})
+
+	It("should grab all metrics from a ControllerManager.", func() {
+		By("Connecting proxying to Pod through the API server")
+		// Check if master Node is registered
+		nodes, err := c.Nodes().List(api.ListOptions{})
+		expectNoError(err)
+
+		var masterRegistered = false
+		for _, node := range nodes.Items {
+			if strings.HasSuffix(node.Name, "master") {
+				masterRegistered = true
+			}
+		}
+		if !masterRegistered {
+			Logf("Master is node registered. Skipping testing ControllerManager metrics.")
+			return
+		}
+		unknownMetrics := sets.NewString()
+		response, err := grabber.GrabFromControllerManager(unknownMetrics)
+		expectNoError(err)
+		Expect(unknownMetrics).To(BeEmpty())
+
+		checkMetrics(metrics.Metrics(response), metrics.KnownControllerManagerMetrics)
+	})
+})