Merge pull request #58320 from hzxuzhonghu/cleanup

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

move prometheus register to pkg/endpoints/metrics/metrics.go

**What this PR does / why we need it**:
delete  k8s.io/apiserver/pkg/endpoints/apiserver.go
move prometheus init from k8s.io/apiserver/pkg/endpoints/apiserver.go to k8s.io/apiserver/pkg/endpoints/metrics/metrics.go

Since  k8s.io/apiserver/pkg/endpoints/apiserver.go only has a metrics init func, which should be in metrics pkg.

**Release note**:

```release-note
NONE
```

/assign @sttts @liggitt

staging/src/k8s.io/apiserver/pkg/endpoints/BUILD

@@ -60,7 +60,6 @@ go_test(
 go_library(
     name = "go_default_library",
     srcs = [
-        "apiserver.go",
         "doc.go",
         "groupversion.go",
         "installer.go",

staging/src/k8s.io/apiserver/pkg/endpoints/apiserver.go

@@ -1,25 +0,0 @@
-/*
-Copyright 2014 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 endpoints
-
-import (
-	"k8s.io/apiserver/pkg/endpoints/metrics"
-)
-
-func init() {
-	metrics.Register()
-}

staging/src/k8s.io/apiserver/pkg/endpoints/metrics/metrics.go

@@ -81,8 +81,8 @@ var (
 	kubectlExeRegexp = regexp.MustCompile(`^.*((?i:kubectl\.exe))`)
 )
 
-// Register all metrics.
-func Register() {
+func init() {
+	// Register all metrics.
 	prometheus.MustRegister(requestCounter)
 	prometheus.MustRegister(longRunningRequestGauge)
 	prometheus.MustRegister(requestLatencies)