Add show hidden flag to kube-proxy

cmd/kube-proxy/app/server_windows.go

@@ -32,6 +32,7 @@ import (
 	"k8s.io/apimachinery/pkg/types"
 	utilnet "k8s.io/apimachinery/pkg/util/net"
 	"k8s.io/client-go/tools/record"
+	"k8s.io/component-base/metrics"
 	"k8s.io/kubernetes/pkg/proxy"
 	proxyconfigapi "k8s.io/kubernetes/pkg/proxy/apis/config"
 	proxyconfigscheme "k8s.io/kubernetes/pkg/proxy/apis/config/scheme"
@@ -67,6 +68,10 @@ func newProxyServer(config *proxyconfigapi.KubeProxyConfiguration, cleanupAndExi
 		return &ProxyServer{}, nil
 	}
 
+	if len(config.ShowHiddenMetricsForVersion) > 0 {
+		metrics.SetShowHidden()
+	}
+
 	client, eventClient, err := createClients(config.ClientConnection, master)
 	if err != nil {
 		return nil, err