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/*
Copyright 2018 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 collectors
import (
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/component-base/metrics"
stats "k8s.io/kubernetes/pkg/kubelet/apis/stats/v1alpha1"
kubeletmetrics "k8s.io/kubernetes/pkg/kubelet/metrics"
serverstats "k8s.io/kubernetes/pkg/kubelet/server/stats"
)
var (
volumeStatsCapacityBytesDesc = metrics.NewDesc(
metrics.BuildFQName("", kubeletmetrics.KubeletSubsystem, kubeletmetrics.VolumeStatsCapacityBytesKey),
"Capacity in bytes of the volume",
[]string{"namespace", "persistentvolumeclaim"}, nil,
metrics.ALPHA, "",
)
volumeStatsAvailableBytesDesc = metrics.NewDesc(
metrics.BuildFQName("", kubeletmetrics.KubeletSubsystem, kubeletmetrics.VolumeStatsAvailableBytesKey),
"Number of available bytes in the volume",
[]string{"namespace", "persistentvolumeclaim"}, nil,
metrics.ALPHA, "",
)
volumeStatsUsedBytesDesc = metrics.NewDesc(
metrics.BuildFQName("", kubeletmetrics.KubeletSubsystem, kubeletmetrics.VolumeStatsUsedBytesKey),
"Number of used bytes in the volume",
[]string{"namespace", "persistentvolumeclaim"}, nil,
metrics.ALPHA, "",
)
volumeStatsInodesDesc = metrics.NewDesc(
metrics.BuildFQName("", kubeletmetrics.KubeletSubsystem, kubeletmetrics.VolumeStatsInodesKey),
"Maximum number of inodes in the volume",
[]string{"namespace", "persistentvolumeclaim"}, nil,
metrics.ALPHA, "",
)
volumeStatsInodesFreeDesc = metrics.NewDesc(
metrics.BuildFQName("", kubeletmetrics.KubeletSubsystem, kubeletmetrics.VolumeStatsInodesFreeKey),
"Number of free inodes in the volume",
[]string{"namespace", "persistentvolumeclaim"}, nil,
metrics.ALPHA, "",
)
volumeStatsInodesUsedDesc = metrics.NewDesc(
metrics.BuildFQName("", kubeletmetrics.KubeletSubsystem, kubeletmetrics.VolumeStatsInodesUsedKey),
"Number of used inodes in the volume",
[]string{"namespace", "persistentvolumeclaim"}, nil,
metrics.ALPHA, "",
)
)
type volumeStatsCollector struct {
metrics.BaseStableCollector
statsProvider serverstats.Provider
}
// Check if volumeStatsCollector implements necessary interface
var _ metrics.StableCollector = &volumeStatsCollector{}
// NewVolumeStatsCollector creates a volume stats metrics.StableCollector.
func NewVolumeStatsCollector(statsProvider serverstats.Provider) metrics.StableCollector {
return &volumeStatsCollector{statsProvider: statsProvider}
}
// DescribeWithStability implements the metrics.StableCollector interface.
func (collector *volumeStatsCollector) DescribeWithStability(ch chan<- *metrics.Desc) {
ch <- volumeStatsCapacityBytesDesc
ch <- volumeStatsAvailableBytesDesc
ch <- volumeStatsUsedBytesDesc
ch <- volumeStatsInodesDesc
ch <- volumeStatsInodesFreeDesc
ch <- volumeStatsInodesUsedDesc
}
// CollectWithStability implements the metrics.StableCollector interface.
func (collector *volumeStatsCollector) CollectWithStability(ch chan<- metrics.Metric) {
podStats, err := collector.statsProvider.ListPodStats()
if err != nil {
return
}
addGauge := func(desc *metrics.Desc, pvcRef *stats.PVCReference, v float64, lv ...string) {
lv = append([]string{pvcRef.Namespace, pvcRef.Name}, lv...)
ch <- metrics.NewLazyConstMetric(desc, metrics.GaugeValue, v, lv...)
}
allPVCs := sets.String{}
for _, podStat := range podStats {
if podStat.VolumeStats == nil {
continue
}
for _, volumeStat := range podStat.VolumeStats {
pvcRef := volumeStat.PVCRef
if pvcRef == nil {
// ignore if no PVC reference
continue
}
pvcUniqStr := pvcRef.Namespace + "/" + pvcRef.Name
if allPVCs.Has(pvcUniqStr) {
// ignore if already collected
continue
}
addGauge(volumeStatsCapacityBytesDesc, pvcRef, float64(*volumeStat.CapacityBytes))
addGauge(volumeStatsAvailableBytesDesc, pvcRef, float64(*volumeStat.AvailableBytes))
addGauge(volumeStatsUsedBytesDesc, pvcRef, float64(*volumeStat.UsedBytes))
addGauge(volumeStatsInodesDesc, pvcRef, float64(*volumeStat.Inodes))
addGauge(volumeStatsInodesFreeDesc, pvcRef, float64(*volumeStat.InodesFree))
addGauge(volumeStatsInodesUsedDesc, pvcRef, float64(*volumeStat.InodesUsed))
allPVCs.Insert(pvcUniqStr)
}
}
}
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