Update k8s dependency version to 1.21

Signed-off-by: xinyanwu409 <wxinyan@vmware>

vendor/k8s.io/component-base/metrics/processstarttime.go

@@ -17,11 +17,8 @@ limitations under the License.
 package metrics
 
 import (
-	"os"
 	"time"
 
-	"github.com/prometheus/procfs"
-
 	"k8s.io/klog/v2"
 )
 
@@ -44,24 +41,11 @@ func RegisterProcessStartTime(registrationFunc func(Registerable) error) error {
 		start = float64(time.Now().Unix())
 	}
 	// processStartTime is a lazy metric which only get initialized after registered.
-	// so we have to explicitly create it before setting the label value. Otherwise
-	// it is a noop.
-	if !processStartTime.IsCreated() {
-		processStartTime.initializeMetric()
+	// so we need to register the metric first and then set the value for it
+	if err = registrationFunc(processStartTime); err != nil {
+		return err
 	}
+
 	processStartTime.WithLabelValues().Set(start)
-	return registrationFunc(processStartTime)
-}
-
-func getProcessStart() (float64, error) {
-	pid := os.Getpid()
-	p, err := procfs.NewProc(pid)
-	if err != nil {
-		return 0, err
-	}
-
-	if stat, err := p.Stat(); err == nil {
-		return stat.StartTime()
-	}
-	return 0, err
+	return nil
 }