Add instrumented service.

Signed-off-by: Lantao Liu <lantaol@google.com>

pkg/server/container_exec.go

@@ -19,21 +19,12 @@ package server
 import (
 	"fmt"
 
-	"github.com/golang/glog"
 	"golang.org/x/net/context"
 	"k8s.io/kubernetes/pkg/kubelet/apis/cri/v1alpha1/runtime"
 )
 
 // Exec prepares a streaming endpoint to execute a command in the container, and returns the address.
-func (c *criContainerdService) Exec(ctx context.Context, r *runtime.ExecRequest) (retRes *runtime.ExecResponse, retErr error) {
-	glog.V(2).Infof("Exec for %q with command %+v, tty %v and stdin %v",
-		r.GetContainerId(), r.GetCmd(), r.GetTty(), r.GetStdin())
-	defer func() {
-		if retErr == nil {
-			glog.V(2).Infof("Exec for %q returns URL %q", r.GetContainerId(), retRes.GetUrl())
-		}
-	}()
-
+func (c *criContainerdService) Exec(ctx context.Context, r *runtime.ExecRequest) (*runtime.ExecResponse, error) {
 	cntr, err := c.containerStore.Get(r.GetContainerId())
 	if err != nil {
 		return nil, fmt.Errorf("failed to find container in store: %v", err)