vendor: Update vendor logic

vendor/k8s.io/apiserver/pkg/storage/etcd3/metrics/metrics.go

@@ -0,0 +1,104 @@
+/*
+Copyright 2015 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package metrics
+
+import (
+	"sync"
+	"time"
+
+	compbasemetrics "k8s.io/component-base/metrics"
+	"k8s.io/component-base/metrics/legacyregistry"
+)
+
+/*
+ * By default, all the following metrics are defined as falling under
+ * ALPHA stability level https://github.com/kubernetes/enhancements/blob/master/keps/sig-instrumentation/20190404-kubernetes-control-plane-metrics-stability.md#stability-classes)
+ *
+ * Promoting the stability level of the metric is a responsibility of the component owner, since it
+ * involves explicitly acknowledging support for the metric across multiple releases, in accordance with
+ * the metric stability policy.
+ */
+var (
+	etcdRequestLatency = compbasemetrics.NewHistogramVec(
+		&compbasemetrics.HistogramOpts{
+			Name:           "etcd_request_duration_seconds",
+			Help:           "Etcd request latency in seconds for each operation and object type.",
+			StabilityLevel: compbasemetrics.ALPHA,
+		},
+		[]string{"operation", "type"},
+	)
+	objectCounts = compbasemetrics.NewGaugeVec(
+		&compbasemetrics.GaugeOpts{
+			Name:           "etcd_object_counts",
+			Help:           "Number of stored objects at the time of last check split by kind.",
+			StabilityLevel: compbasemetrics.ALPHA,
+		},
+		[]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
+
+// Register all metrics.
+func Register() {
+	// Register the metrics.
+	registerMetrics.Do(func() {
+		legacyregistry.MustRegister(etcdRequestLatency)
+		legacyregistry.MustRegister(objectCounts)
+
+		// TODO(danielqsj): Remove the following metrics, they are deprecated
+		legacyregistry.MustRegister(deprecatedEtcdRequestLatenciesSummary)
+	})
+}
+
+// UpdateObjectCount sets the etcd_object_counts metric.
+func UpdateObjectCount(resourcePrefix string, count int64) {
+	objectCounts.WithLabelValues(resourcePrefix).Set(float64(count))
+}
+
+// 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.
+func sinceInSeconds(start time.Time) float64 {
+	return time.Since(start).Seconds()
+}