metrics.go

Documentation: k8s.io/kubernetes/pkg/kubelet/pluginmanager/metrics

     1  /*
     2  Copyright 2019 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package metrics
    18  
    19  import (
    20  	"sync"
    21  
    22  	"k8s.io/component-base/metrics"
    23  	"k8s.io/component-base/metrics/legacyregistry"
    24  	"k8s.io/kubernetes/pkg/kubelet/pluginmanager/cache"
    25  )
    26  
    27  const (
    28  	// Metric keys for Plugin Manager.
    29  	pluginManagerTotalPlugins = "plugin_manager_total_plugins"
    30  )
    31  
    32  var (
    33  	registerMetrics sync.Once
    34  
    35  	totalPluginsDesc = metrics.NewDesc(
    36  		pluginManagerTotalPlugins,
    37  		"Number of plugins in Plugin Manager",
    38  		[]string{"socket_path", "state"},
    39  		nil,
    40  		metrics.ALPHA,
    41  		"",
    42  	)
    43  )
    44  
    45  // pluginCount is a map of maps used as a counter.
    46  type pluginCount map[string]map[string]int64
    47  
    48  func (pc pluginCount) add(state, pluginName string) {
    49  	count, ok := pc[state]
    50  	if !ok {
    51  		count = map[string]int64{}
    52  	}
    53  	count[pluginName]++
    54  	pc[state] = count
    55  }
    56  
    57  // Register registers Plugin Manager metrics.
    58  func Register(asw cache.ActualStateOfWorld, dsw cache.DesiredStateOfWorld) {
    59  	registerMetrics.Do(func() {
    60  		legacyregistry.CustomMustRegister(&totalPluginsCollector{asw: asw, dsw: dsw})
    61  	})
    62  }
    63  
    64  type totalPluginsCollector struct {
    65  	metrics.BaseStableCollector
    66  
    67  	asw cache.ActualStateOfWorld
    68  	dsw cache.DesiredStateOfWorld
    69  }
    70  
    71  var _ metrics.StableCollector = &totalPluginsCollector{}
    72  
    73  // DescribeWithStability implements the metrics.StableCollector interface.
    74  func (c *totalPluginsCollector) DescribeWithStability(ch chan<- *metrics.Desc) {
    75  	ch <- totalPluginsDesc
    76  }
    77  
    78  // CollectWithStability implements the metrics.StableCollector interface.
    79  func (c *totalPluginsCollector) CollectWithStability(ch chan<- metrics.Metric) {
    80  	for stateName, pluginCount := range c.getPluginCount() {
    81  		for socketPath, count := range pluginCount {
    82  			ch <- metrics.NewLazyConstMetric(totalPluginsDesc,
    83  				metrics.GaugeValue,
    84  				float64(count),
    85  				socketPath,
    86  				stateName)
    87  		}
    88  	}
    89  }
    90  
    91  func (c *totalPluginsCollector) getPluginCount() pluginCount {
    92  	counter := make(pluginCount)
    93  	for _, registeredPlugin := range c.asw.GetRegisteredPlugins() {
    94  		socketPath := registeredPlugin.SocketPath
    95  		counter.add("actual_state_of_world", socketPath)
    96  	}
    97  
    98  	for _, pluginToRegister := range c.dsw.GetPluginsToRegister() {
    99  		socketPath := pluginToRegister.SocketPath
   100  		counter.add("desired_state_of_world", socketPath)
   101  	}
   102  	return counter
   103  }
   104
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