Merge pull request #64741 from wgliang/master.etcd-prometheus-metics

Automatic merge from submit-queue (batch tested with PRs 64741, 65484). 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>.

enable etcdv3 client prometheus metics

**What this PR does / why we need it**:

Provide a way to enable etcdv3 client prometheus metics

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #64740

**Special notes for your reviewer**:

**Release note**:

```release-note
Enable etcdv3 client prometheus metics
```

staging/src/k8s.io/apiserver/pkg/storage/storagebackend/factory/BUILD

@@ -44,6 +44,8 @@ go_library(
         "//vendor/github.com/coreos/etcd/client:go_default_library",
         "//vendor/github.com/coreos/etcd/clientv3:go_default_library",
         "//vendor/github.com/coreos/etcd/pkg/transport:go_default_library",
+        "//vendor/github.com/grpc-ecosystem/go-grpc-prometheus:go_default_library",
+        "//vendor/google.golang.org/grpc:go_default_library",
     ],
 )
 

staging/src/k8s.io/apiserver/pkg/storage/storagebackend/factory/etcd3.go

@@ -24,6 +24,8 @@ import (
 
 	"github.com/coreos/etcd/clientv3"
 	"github.com/coreos/etcd/pkg/transport"
+	grpcprom "github.com/grpc-ecosystem/go-grpc-prometheus"
+	"google.golang.org/grpc"
 
 	"k8s.io/apimachinery/pkg/util/wait"
 	"k8s.io/apiserver/pkg/storage"
@@ -94,8 +96,12 @@ func newETCD3Client(c storagebackend.Config) (*clientv3.Client, error) {
 		DialTimeout:          dialTimeout,
 		DialKeepAliveTime:    keepaliveTime,
 		DialKeepAliveTimeout: keepaliveTimeout,
-		Endpoints:            c.ServerList,
-		TLS:                  tlsConfig,
+		DialOptions: []grpc.DialOption{
+			grpc.WithUnaryInterceptor(grpcprom.UnaryClientInterceptor),
+			grpc.WithStreamInterceptor(grpcprom.StreamClientInterceptor),
+		},
+		Endpoints: c.ServerList,
+		TLS:       tlsConfig,
 	}
 	client, err := clientv3.New(cfg)
 	return client, err

staging/src/k8s.io/kube-aggregator/Godeps/Godeps.json

@@ -198,6 +198,10 @@
 			"ImportPath": "github.com/gregjones/httpcache/diskcache",
 			"Rev": "787624de3eb7bd915c329cba748687a3b22666a6"
 		},
+		{
+			"ImportPath": "github.com/grpc-ecosystem/go-grpc-prometheus",
+			"Rev": "2500245aa6110c562d17020fb31a2c133d737799"
+		},
 		{
 			"ImportPath": "github.com/hashicorp/golang-lru",
 			"Rev": "a0d98a5f288019575c6d1f4bb1573fef2d1fcdc4"

staging/src/k8s.io/sample-apiserver/Godeps/Godeps.json

@@ -190,6 +190,10 @@
 			"ImportPath": "github.com/gregjones/httpcache/diskcache",
 			"Rev": "787624de3eb7bd915c329cba748687a3b22666a6"
 		},
+		{
+			"ImportPath": "github.com/grpc-ecosystem/go-grpc-prometheus",
+			"Rev": "2500245aa6110c562d17020fb31a2c133d737799"
+		},
 		{
 			"ImportPath": "github.com/hashicorp/golang-lru",
 			"Rev": "a0d98a5f288019575c6d1f4bb1573fef2d1fcdc4"