migrate kube-proxy metrics to stability framework

cmd/kube-proxy/app/server.go

@@ -22,6 +22,7 @@ import (
 	"errors"
 	"fmt"
 	"io/ioutil"
+	"k8s.io/component-base/metrics/legacyregistry"
 	"net/http"
 	"os"
 	goruntime "runtime"
@@ -74,7 +75,6 @@ import (
 	utilpointer "k8s.io/utils/pointer"
 
 	"github.com/fsnotify/fsnotify"
-	"github.com/prometheus/client_golang/prometheus"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
 	"k8s.io/klog"
@@ -549,7 +549,7 @@ func (s *ProxyServer) Run() error {
 		proxyMux.HandleFunc("/proxyMode", func(w http.ResponseWriter, r *http.Request) {
 			fmt.Fprintf(w, "%s", s.ProxyMode)
 		})
-		proxyMux.Handle("/metrics", prometheus.Handler())
+		proxyMux.Handle("/metrics", legacyregistry.Handler())
 		if s.EnableProfiling {
 			routes.Profiling{}.Install(proxyMux)
 		}