volume_stats.go

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

     1  /*
     2  Copyright 2018 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 collectors
    18  
    19  import (
    20  	"context"
    21  
    22  	"k8s.io/apimachinery/pkg/util/sets"
    23  	"k8s.io/component-base/metrics"
    24  	stats "k8s.io/kubelet/pkg/apis/stats/v1alpha1"
    25  	kubeletmetrics "k8s.io/kubernetes/pkg/kubelet/metrics"
    26  	serverstats "k8s.io/kubernetes/pkg/kubelet/server/stats"
    27  )
    28  
    29  var (
    30  	volumeStatsCapacityBytesDesc = metrics.NewDesc(
    31  		metrics.BuildFQName("", kubeletmetrics.KubeletSubsystem, kubeletmetrics.VolumeStatsCapacityBytesKey),
    32  		"Capacity in bytes of the volume",
    33  		[]string{"namespace", "persistentvolumeclaim"}, nil,
    34  		metrics.ALPHA, "",
    35  	)
    36  	volumeStatsAvailableBytesDesc = metrics.NewDesc(
    37  		metrics.BuildFQName("", kubeletmetrics.KubeletSubsystem, kubeletmetrics.VolumeStatsAvailableBytesKey),
    38  		"Number of available bytes in the volume",
    39  		[]string{"namespace", "persistentvolumeclaim"}, nil,
    40  		metrics.ALPHA, "",
    41  	)
    42  	volumeStatsUsedBytesDesc = metrics.NewDesc(
    43  		metrics.BuildFQName("", kubeletmetrics.KubeletSubsystem, kubeletmetrics.VolumeStatsUsedBytesKey),
    44  		"Number of used bytes in the volume",
    45  		[]string{"namespace", "persistentvolumeclaim"}, nil,
    46  		metrics.ALPHA, "",
    47  	)
    48  	volumeStatsInodesDesc = metrics.NewDesc(
    49  		metrics.BuildFQName("", kubeletmetrics.KubeletSubsystem, kubeletmetrics.VolumeStatsInodesKey),
    50  		"Maximum number of inodes in the volume",
    51  		[]string{"namespace", "persistentvolumeclaim"}, nil,
    52  		metrics.ALPHA, "",
    53  	)
    54  	volumeStatsInodesFreeDesc = metrics.NewDesc(
    55  		metrics.BuildFQName("", kubeletmetrics.KubeletSubsystem, kubeletmetrics.VolumeStatsInodesFreeKey),
    56  		"Number of free inodes in the volume",
    57  		[]string{"namespace", "persistentvolumeclaim"}, nil,
    58  		metrics.ALPHA, "",
    59  	)
    60  	volumeStatsInodesUsedDesc = metrics.NewDesc(
    61  		metrics.BuildFQName("", kubeletmetrics.KubeletSubsystem, kubeletmetrics.VolumeStatsInodesUsedKey),
    62  		"Number of used inodes in the volume",
    63  		[]string{"namespace", "persistentvolumeclaim"}, nil,
    64  		metrics.ALPHA, "",
    65  	)
    66  
    67  	volumeStatsHealthAbnormalDesc = metrics.NewDesc(
    68  		metrics.BuildFQName("", kubeletmetrics.KubeletSubsystem, kubeletmetrics.VolumeStatsHealthStatusAbnormalKey),
    69  		"Abnormal volume health status. The count is either 1 or 0. 1 indicates the volume is unhealthy, 0 indicates volume is healthy",
    70  		[]string{"namespace", "persistentvolumeclaim"}, nil,
    71  		metrics.ALPHA, "")
    72  )
    73  
    74  type volumeStatsCollector struct {
    75  	metrics.BaseStableCollector
    76  
    77  	statsProvider serverstats.Provider
    78  }
    79  
    80  // Check if volumeStatsCollector implements necessary interface
    81  var _ metrics.StableCollector = &volumeStatsCollector{}
    82  
    83  // NewVolumeStatsCollector creates a volume stats metrics.StableCollector.
    84  func NewVolumeStatsCollector(statsProvider serverstats.Provider) metrics.StableCollector {
    85  	return &volumeStatsCollector{statsProvider: statsProvider}
    86  }
    87  
    88  // DescribeWithStability implements the metrics.StableCollector interface.
    89  func (collector *volumeStatsCollector) DescribeWithStability(ch chan<- *metrics.Desc) {
    90  	ch <- volumeStatsCapacityBytesDesc
    91  	ch <- volumeStatsAvailableBytesDesc
    92  	ch <- volumeStatsUsedBytesDesc
    93  	ch <- volumeStatsInodesDesc
    94  	ch <- volumeStatsInodesFreeDesc
    95  	ch <- volumeStatsInodesUsedDesc
    96  	ch <- volumeStatsHealthAbnormalDesc
    97  }
    98  
    99  // CollectWithStability implements the metrics.StableCollector interface.
   100  func (collector *volumeStatsCollector) CollectWithStability(ch chan<- metrics.Metric) {
   101  	ctx := context.Background()
   102  	podStats, err := collector.statsProvider.ListPodStats(ctx)
   103  	if err != nil {
   104  		return
   105  	}
   106  	addGauge := func(desc *metrics.Desc, pvcRef *stats.PVCReference, v float64, lv ...string) {
   107  		lv = append([]string{pvcRef.Namespace, pvcRef.Name}, lv...)
   108  		ch <- metrics.NewLazyConstMetric(desc, metrics.GaugeValue, v, lv...)
   109  	}
   110  	allPVCs := sets.String{}
   111  	for _, podStat := range podStats {
   112  		if podStat.VolumeStats == nil {
   113  			continue
   114  		}
   115  		for _, volumeStat := range podStat.VolumeStats {
   116  			pvcRef := volumeStat.PVCRef
   117  			if pvcRef == nil {
   118  				// ignore if no PVC reference
   119  				continue
   120  			}
   121  			pvcUniqStr := pvcRef.Namespace + "/" + pvcRef.Name
   122  			if allPVCs.Has(pvcUniqStr) {
   123  				// ignore if already collected
   124  				continue
   125  			}
   126  			addGauge(volumeStatsCapacityBytesDesc, pvcRef, float64(*volumeStat.CapacityBytes))
   127  			addGauge(volumeStatsAvailableBytesDesc, pvcRef, float64(*volumeStat.AvailableBytes))
   128  			addGauge(volumeStatsUsedBytesDesc, pvcRef, float64(*volumeStat.UsedBytes))
   129  			addGauge(volumeStatsInodesDesc, pvcRef, float64(*volumeStat.Inodes))
   130  			addGauge(volumeStatsInodesFreeDesc, pvcRef, float64(*volumeStat.InodesFree))
   131  			addGauge(volumeStatsInodesUsedDesc, pvcRef, float64(*volumeStat.InodesUsed))
   132  			if volumeStat.VolumeHealthStats != nil {
   133  				addGauge(volumeStatsHealthAbnormalDesc, pvcRef, convertBoolToFloat64(volumeStat.VolumeHealthStats.Abnormal))
   134  			}
   135  			allPVCs.Insert(pvcUniqStr)
   136  		}
   137  	}
   138  }
   139  
   140  func convertBoolToFloat64(boolVal bool) float64 {
   141  	if boolVal {
   142  		return 1
   143  	}
   144  
   145  	return 0
   146  }
   147
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