mirror of https://github.com/k3s-io/k3s
105 lines
2.7 KiB
Go
105 lines
2.7 KiB
Go
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/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package metrics
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import (
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"sync"
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"github.com/prometheus/client_golang/prometheus"
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"k8s.io/klog"
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"k8s.io/kubernetes/pkg/kubelet/pluginmanager/cache"
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)
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const (
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pluginNameNotAvailable = "N/A"
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// Metric keys for Plugin Manager.
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pluginManagerTotalPlugins = "plugin_manager_total_plugins"
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)
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var (
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registerMetrics sync.Once
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totalPluginsDesc = prometheus.NewDesc(
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pluginManagerTotalPlugins,
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"Number of plugins in Plugin Manager",
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[]string{"socket_path", "state"},
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nil,
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)
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)
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// pluginCount is a map of maps used as a counter.
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type pluginCount map[string]map[string]int64
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func (pc pluginCount) add(state, pluginName string) {
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count, ok := pc[state]
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if !ok {
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count = map[string]int64{}
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}
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count[pluginName]++
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pc[state] = count
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}
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// Register registers Plugin Manager metrics.
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func Register(asw cache.ActualStateOfWorld, dsw cache.DesiredStateOfWorld) {
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registerMetrics.Do(func() {
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prometheus.MustRegister(&totalPluginsCollector{asw, dsw})
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})
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}
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type totalPluginsCollector struct {
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asw cache.ActualStateOfWorld
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dsw cache.DesiredStateOfWorld
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}
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var _ prometheus.Collector = &totalPluginsCollector{}
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// Describe implements the prometheus.Collector interface.
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func (c *totalPluginsCollector) Describe(ch chan<- *prometheus.Desc) {
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ch <- totalPluginsDesc
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}
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// Collect implements the prometheus.Collector interface.
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func (c *totalPluginsCollector) Collect(ch chan<- prometheus.Metric) {
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for stateName, pluginCount := range c.getPluginCount() {
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for socketPath, count := range pluginCount {
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metric, err := prometheus.NewConstMetric(totalPluginsDesc,
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prometheus.GaugeValue,
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float64(count),
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socketPath,
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stateName)
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if err != nil {
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klog.Warningf("Failed to create metric : %v", err)
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}
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ch <- metric
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}
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}
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}
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func (c *totalPluginsCollector) getPluginCount() pluginCount {
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counter := make(pluginCount)
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for _, registeredPlugin := range c.asw.GetRegisteredPlugins() {
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socketPath := registeredPlugin.SocketPath
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counter.add("actual_state_of_world", socketPath)
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}
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for _, pluginToRegister := range c.dsw.GetPluginsToRegister() {
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socketPath := pluginToRegister.SocketPath
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counter.add("desired_state_of_world", socketPath)
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}
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return counter
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}
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