remove deprecated metrics of etcd

staging/src/k8s.io/apiserver/pkg/storage/etcd3/metrics/metrics.go

@@ -49,16 +49,6 @@ var (
 		},
 		[]string{"resource"},
 	)
-
-	deprecatedEtcdRequestLatenciesSummary = compbasemetrics.NewSummaryVec(
-		&compbasemetrics.SummaryOpts{
-			Name:              "etcd_request_latencies_summary",
-			Help:              "Etcd request latency summary in microseconds for each operation and object type.",
-			StabilityLevel:    compbasemetrics.ALPHA,
-			DeprecatedVersion: "1.14.0",
-		},
-		[]string{"operation", "type"},
-	)
 )
 
 var registerMetrics sync.Once
@@ -69,9 +59,6 @@ func Register() {
 	registerMetrics.Do(func() {
 		legacyregistry.MustRegister(etcdRequestLatency)
 		legacyregistry.MustRegister(objectCounts)
-
-		// TODO(danielqsj): Remove the following metrics, they are deprecated
-		legacyregistry.MustRegister(deprecatedEtcdRequestLatenciesSummary)
 	})
 }
 
@@ -83,19 +70,11 @@ func UpdateObjectCount(resourcePrefix string, count int64) {
 // RecordEtcdRequestLatency sets the etcd_request_duration_seconds metrics.
 func RecordEtcdRequestLatency(verb, resource string, startTime time.Time) {
 	etcdRequestLatency.WithLabelValues(verb, resource).Observe(sinceInSeconds(startTime))
-	deprecatedEtcdRequestLatenciesSummary.WithLabelValues(verb, resource).Observe(sinceInMicroseconds(startTime))
 }
 
 // Reset resets the etcd_request_duration_seconds metric.
 func Reset() {
 	etcdRequestLatency.Reset()
-
-	deprecatedEtcdRequestLatenciesSummary.Reset()
-}
-
-// sinceInMicroseconds gets the time since the specified start in microseconds.
-func sinceInMicroseconds(start time.Time) float64 {
-	return float64(time.Since(start).Nanoseconds() / time.Microsecond.Nanoseconds())
 }
 
 // sinceInSeconds gets the time since the specified start in seconds.