change CounterVec to use Counter in the Kubelet's Pod Lifecycle Event Generator

pkg/kubelet/metrics/metrics.go

@@ -165,17 +165,16 @@ var (
 			StabilityLevel: metrics.ALPHA,
 		},
 	)
-	// PLEGDiscardEvents is a Histogram that tracks the duration (in seconds) it takes for discarding events in the Kubelet's
-	// Pod Lifecycle Event Generator (PLEG).
-	PLEGDiscardEvents = metrics.NewCounterVec(
+	// PLEGDiscardEvents is a Counter that tracks the number of discarding events in the Kubelet's Pod Lifecycle Event Generator (PLEG).
+	PLEGDiscardEvents = metrics.NewCounter(
 		&metrics.CounterOpts{
 			Subsystem:      KubeletSubsystem,
 			Name:           PLEGDiscardEventsKey,
 			Help:           "The number of discard events in PLEG.",
 			StabilityLevel: metrics.ALPHA,
 		},
-		[]string{},
 	)
+
 	// PLEGRelistInterval is a Histogram that tracks the intervals (in seconds) between relisting in the Kubelet's
 	// Pod Lifecycle Event Generator (PLEG).
 	PLEGRelistInterval = metrics.NewHistogram(

pkg/kubelet/pleg/generic.go

@@ -272,7 +272,7 @@ func (g *GenericPLEG) relist() {
 			select {
 			case g.eventChannel <- events[i]:
 			default:
-				metrics.PLEGDiscardEvents.WithLabelValues().Inc()
+				metrics.PLEGDiscardEvents.Inc()
 				klog.Error("event channel is full, discard this relist() cycle event")
 			}
 		}