Remove empty metrics.go file and method call

pkg/controller/nodeipam/BUILD

@@ -26,7 +26,6 @@ go_library(
     name = "go_default_library",
     srcs = [
         "doc.go",
-        "metrics.go",
         "node_ipam_controller.go",
     ],
     importpath = "k8s.io/kubernetes/pkg/controller/nodeipam",

pkg/controller/nodeipam/metrics.go

-/*
-Copyright 2016 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 nodeipam
-
-// Register the metrics that are to be monitored.
-func Register() {
-}

pkg/controller/nodeipam/node_ipam_controller.go

@@ -39,11 +39,6 @@ import (
 	"k8s.io/kubernetes/pkg/util/metrics"
 )
 
-func init() {
-	// Register prometheus metrics
-	Register()
-}
-
 const (
 	// ipamResyncInterval is the amount of time between when the cloud and node
 	// CIDR range assignments are synchronized.