Add metrics handler in controller manager.

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

@@ -35,6 +35,7 @@ import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/cloudprovider/nodecontroller"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/cloudprovider/servicecontroller"
 	replicationControllerPkg "github.com/GoogleCloudPlatform/kubernetes/pkg/controller"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/healthz"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/master/ports"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/namespace"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/resourcequota"
@@ -42,6 +43,7 @@ import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
 
 	"github.com/golang/glog"
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/spf13/pflag"
 )
 
@@ -179,13 +181,20 @@ func (s *CMServer) Run(_ []string) error {
 	}
 
 	go func() {
+		mux := http.NewServeMux()
+		healthz.InstallHandler(mux)
 		if s.EnableProfiling {
-			mux := http.NewServeMux()
 			mux.HandleFunc("/debug/pprof/", pprof.Index)
 			mux.HandleFunc("/debug/pprof/profile", pprof.Profile)
 			mux.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
 		}
-		http.ListenAndServe(net.JoinHostPort(s.Address.String(), strconv.Itoa(s.Port)), nil)
+		mux.Handle("/metrics", prometheus.Handler())
+
+		server := &http.Server{
+			Addr:    net.JoinHostPort(s.Address.String(), strconv.Itoa(s.Port)),
+			Handler: mux,
+		}
+		glog.Fatal(server.ListenAndServe())
 	}()
 
 	endpoints := service.NewEndpointController(kubeClient)