add explicit stability levels for shared metrics

Change-Id: I1ad650379b8d0cad76596cdc3fe70397e24abba8

staging/src/k8s.io/component-base/metrics/prometheus/clientgo/leaderelection/metrics.go

@@ -24,8 +24,9 @@ import (
 
 var (
 	leaderGauge = k8smetrics.NewGaugeVec(&k8smetrics.GaugeOpts{
-		Name: "leader_election_master_status",
-		Help: "Gauge of if the reporting system is master of the relevant lease, 0 indicates backup, 1 indicates master. 'name' is the string used to identify the lease. Please make sure to group by name.",
+		Name:           "leader_election_master_status",
+		StabilityLevel: k8smetrics.ALPHA,
+		Help:           "Gauge of if the reporting system is master of the relevant lease, 0 indicates backup, 1 indicates master. 'name' is the string used to identify the lease. Please make sure to group by name.",
 	}, []string{"name"})
 )
 

staging/src/k8s.io/component-base/metrics/prometheus/restclient/metrics.go

@@ -65,17 +65,19 @@ var (
 
 	rateLimiterLatency = k8smetrics.NewHistogramVec(
 		&k8smetrics.HistogramOpts{
-			Name:    "rest_client_rate_limiter_duration_seconds",
-			Help:    "Client side rate limiter latency in seconds. Broken down by verb, and host.",
-			Buckets: []float64{0.005, 0.025, 0.1, 0.25, 0.5, 1.0, 2.0, 4.0, 8.0, 15.0, 30.0, 60.0},
+			Name:           "rest_client_rate_limiter_duration_seconds",
+			Help:           "Client side rate limiter latency in seconds. Broken down by verb, and host.",
+			StabilityLevel: k8smetrics.ALPHA,
+			Buckets:        []float64{0.005, 0.025, 0.1, 0.25, 0.5, 1.0, 2.0, 4.0, 8.0, 15.0, 30.0, 60.0},
 		},
 		[]string{"verb", "host"},
 	)
 
 	requestResult = k8smetrics.NewCounterVec(
 		&k8smetrics.CounterOpts{
-			Name: "rest_client_requests_total",
-			Help: "Number of HTTP requests, partitioned by status code, method, and host.",
+			Name:           "rest_client_requests_total",
+			StabilityLevel: k8smetrics.ALPHA,
+			Help:           "Number of HTTP requests, partitioned by status code, method, and host.",
 		},
 		[]string{"code", "method", "host"},
 	)
@@ -113,6 +115,7 @@ var (
 			//   - 4 hours - 1 month: captures an ideal rotation cadence.
 			//   - 3 months - 4 years: captures a rotation cadence which is
 			//     is probably too slow or much too slow.
+			StabilityLevel: k8smetrics.ALPHA,
 			Buckets: []float64{
 				600,       // 10 minutes
 				1800,      // 30 minutes
@@ -131,7 +134,8 @@ var (
 
 	execPluginCalls = k8smetrics.NewCounterVec(
 		&k8smetrics.CounterOpts{
-			Name: "rest_client_exec_plugin_call_total",
+			StabilityLevel: k8smetrics.ALPHA,
+			Name:           "rest_client_exec_plugin_call_total",
 			Help: "Number of calls to an exec plugin, partitioned by the type of " +
 				"event encountered (no_error, plugin_execution_error, plugin_not_found_error, " +
 				"client_internal_error) and an optional exit code. The exit code will " +

staging/src/k8s.io/component-base/metrics/prometheus/workqueue/metrics.go

@@ -39,34 +39,39 @@ const (
 
 var (
 	depth = k8smetrics.NewGaugeVec(&k8smetrics.GaugeOpts{
-		Subsystem: WorkQueueSubsystem,
-		Name:      DepthKey,
-		Help:      "Current depth of workqueue",
+		Subsystem:      WorkQueueSubsystem,
+		Name:           DepthKey,
+		StabilityLevel: k8smetrics.ALPHA,
+		Help:           "Current depth of workqueue",
 	}, []string{"name"})
 
 	adds = k8smetrics.NewCounterVec(&k8smetrics.CounterOpts{
-		Subsystem: WorkQueueSubsystem,
-		Name:      AddsKey,
-		Help:      "Total number of adds handled by workqueue",
+		Subsystem:      WorkQueueSubsystem,
+		Name:           AddsKey,
+		StabilityLevel: k8smetrics.ALPHA,
+		Help:           "Total number of adds handled by workqueue",
 	}, []string{"name"})
 
 	latency = k8smetrics.NewHistogramVec(&k8smetrics.HistogramOpts{
-		Subsystem: WorkQueueSubsystem,
-		Name:      QueueLatencyKey,
-		Help:      "How long in seconds an item stays in workqueue before being requested.",
-		Buckets:   k8smetrics.ExponentialBuckets(10e-9, 10, 10),
+		Subsystem:      WorkQueueSubsystem,
+		Name:           QueueLatencyKey,
+		StabilityLevel: k8smetrics.ALPHA,
+		Help:           "How long in seconds an item stays in workqueue before being requested.",
+		Buckets:        k8smetrics.ExponentialBuckets(10e-9, 10, 10),
 	}, []string{"name"})
 
 	workDuration = k8smetrics.NewHistogramVec(&k8smetrics.HistogramOpts{
-		Subsystem: WorkQueueSubsystem,
-		Name:      WorkDurationKey,
-		Help:      "How long in seconds processing an item from workqueue takes.",
-		Buckets:   k8smetrics.ExponentialBuckets(10e-9, 10, 10),
+		Subsystem:      WorkQueueSubsystem,
+		Name:           WorkDurationKey,
+		StabilityLevel: k8smetrics.ALPHA,
+		Help:           "How long in seconds processing an item from workqueue takes.",
+		Buckets:        k8smetrics.ExponentialBuckets(10e-9, 10, 10),
 	}, []string{"name"})
 
 	unfinished = k8smetrics.NewGaugeVec(&k8smetrics.GaugeOpts{
-		Subsystem: WorkQueueSubsystem,
-		Name:      UnfinishedWorkKey,
+		Subsystem:      WorkQueueSubsystem,
+		Name:           UnfinishedWorkKey,
+		StabilityLevel: k8smetrics.ALPHA,
 		Help: "How many seconds of work has done that " +
 			"is in progress and hasn't been observed by work_duration. Large " +
 			"values indicate stuck threads. One can deduce the number of stuck " +
@@ -74,16 +79,18 @@ var (
 	}, []string{"name"})
 
 	longestRunningProcessor = k8smetrics.NewGaugeVec(&k8smetrics.GaugeOpts{
-		Subsystem: WorkQueueSubsystem,
-		Name:      LongestRunningProcessorKey,
+		Subsystem:      WorkQueueSubsystem,
+		Name:           LongestRunningProcessorKey,
+		StabilityLevel: k8smetrics.ALPHA,
 		Help: "How many seconds has the longest running " +
 			"processor for workqueue been running.",
 	}, []string{"name"})
 
 	retries = k8smetrics.NewCounterVec(&k8smetrics.CounterOpts{
-		Subsystem: WorkQueueSubsystem,
-		Name:      RetriesKey,
-		Help:      "Total number of retries handled by workqueue",
+		Subsystem:      WorkQueueSubsystem,
+		Name:           RetriesKey,
+		StabilityLevel: k8smetrics.ALPHA,
+		Help:           "Total number of retries handled by workqueue",
 	}, []string{"name"})
 
 	metrics = []k8smetrics.Registerable{