decouple workqueue metrics from prometheus

pkg/util/workqueue/prometheus/prometheus.go

@@ -0,0 +1,82 @@
+/*
+Copyright 2016 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 prometheus
+
+import (
+	"k8s.io/kubernetes/pkg/util/workqueue"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+// Package prometheus sets the workqueue DefaultMetricsFactory to produce
+// prometheus metrics. To use this package, you just have to import it.
+
+func init() {
+	workqueue.SetProvider(prometheusMetricsProvider{})
+}
+
+type prometheusMetricsProvider struct{}
+
+func (_ prometheusMetricsProvider) NewDepthMetric(name string) workqueue.GaugeMetric {
+	depth := prometheus.NewGauge(prometheus.GaugeOpts{
+		Subsystem: name,
+		Name:      "depth",
+		Help:      "Current depth of workqueue: " + name,
+	})
+	prometheus.Register(depth)
+	return depth
+}
+
+func (_ prometheusMetricsProvider) NewAddsMetric(name string) workqueue.CounterMetric {
+	adds := prometheus.NewCounter(prometheus.CounterOpts{
+		Subsystem: name,
+		Name:      "adds",
+		Help:      "Total number of adds handled by workqueue: " + name,
+	})
+	prometheus.Register(adds)
+	return adds
+}
+
+func (_ prometheusMetricsProvider) NewLatencyMetric(name string) workqueue.SummaryMetric {
+	latency := prometheus.NewSummary(prometheus.SummaryOpts{
+		Subsystem: name,
+		Name:      "queue_latency",
+		Help:      "How long an item stays in workqueue" + name + " before being requested.",
+	})
+	prometheus.Register(latency)
+	return latency
+}
+
+func (_ prometheusMetricsProvider) NewWorkDurationMetric(name string) workqueue.SummaryMetric {
+	workDuration := prometheus.NewSummary(prometheus.SummaryOpts{
+		Subsystem: name,
+		Name:      "work_duration",
+		Help:      "How long processing an item from workqueue" + name + " takes.",
+	})
+	prometheus.Register(workDuration)
+	return workDuration
+}
+
+func (_ prometheusMetricsProvider) NewRetriesMetric(name string) workqueue.CounterMetric {
+	retries := prometheus.NewCounter(prometheus.CounterOpts{
+		Subsystem: name,
+		Name:      "retries",
+		Help:      "Total number of retries handled by workqueue: " + name,
+	})
+	prometheus.Register(retries)
+	return retries
+}