Fix the incorrect metrics setting/naming in nodeshutdown manager

Author: zylxjtu

pkg/kubelet/metrics/metrics.go

@@ -739,7 +739,7 @@ var (
 		&metrics.GaugeOpts{
 			Subsystem:      KubeletSubsystem,
 			Name:           "graceful_shutdown_end_time_seconds",
-			Help:           "Last graceful shutdown start time since unix epoch in seconds",
+			Help:           "Last graceful shutdown end time since unix epoch in seconds",
 			StabilityLevel: metrics.ALPHA,
 		},
 	)

pkg/kubelet/nodeshutdown/nodeshutdown_manager_linux.go

@@ -321,7 +321,7 @@ func (m *managerImpl) processShutdownEvent() error {
 			if err != nil {
 				m.logger.Error(err, "Failed to store graceful shutdown state")
 			}
-			metrics.GracefulShutdownStartTime.Set(timestamp(endTime))
+			metrics.GracefulShutdownEndTime.Set(timestamp(endTime))
 		}()
 	}