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Merge pull request #944 from tydra-wang/feat-rootfs-metrics
feat: add rootfs and ephemeral storage metrics
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,140 @@ | ||
| package metric | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "fmt" | ||
| "io" | ||
| "net/http" | ||
| "time" | ||
|
|
||
| "github.com/prometheus/client_golang/prometheus" | ||
| "k8s.io/client-go/rest" | ||
| "k8s.io/client-go/transport" | ||
| statsapi "k8s.io/kubelet/pkg/apis/stats/v1alpha1" | ||
| ) | ||
|
|
||
| const ( | ||
| saTokenFile = "/var/run/secrets/kubernetes.io/serviceaccount/token" | ||
| kubeletStatsSummaryUrl = "https://localhost:10250/stats/summary" | ||
| kubeletHttpTimeout = time.Second * 5 | ||
| ) | ||
|
|
||
| type fsStatsMetric struct { | ||
| desc *prometheus.Desc | ||
| getValue func(*statsapi.FsStats) *float64 | ||
| } | ||
|
|
||
| func (m *fsStatsMetric) Metric(fsStats *statsapi.FsStats, labels ...string) prometheus.Metric { | ||
| value := m.getValue(fsStats) | ||
| if value == nil { | ||
| return nil | ||
| } | ||
| return prometheus.MustNewConstMetric(m.desc, prometheus.GaugeValue, *value, labels...) | ||
| } | ||
|
|
||
| func uint64ToFloat64(value *uint64) *float64 { | ||
| if value == nil { | ||
| return nil | ||
| } | ||
| fValue := float64(*value) | ||
| return &fValue | ||
| } | ||
|
|
||
| func generateFsStatsDescs(namespace, subsystem string, labels []string) []*fsStatsMetric { | ||
| return []*fsStatsMetric{ | ||
| { | ||
| desc: prometheus.NewDesc(prometheus.BuildFQName(namespace, subsystem, "inodes_free"), "Number of available Inodes", labels, nil), | ||
| getValue: func(fs *statsapi.FsStats) *float64 { return uint64ToFloat64(fs.InodesFree) }, | ||
| }, | ||
| { | ||
| desc: prometheus.NewDesc(prometheus.BuildFQName(namespace, subsystem, "inodes_total"), "Total number of Inodes", labels, nil), | ||
| getValue: func(fs *statsapi.FsStats) *float64 { return uint64ToFloat64(fs.Inodes) }, | ||
| }, | ||
| { | ||
| desc: prometheus.NewDesc(prometheus.BuildFQName(namespace, subsystem, "inodes_used"), "Number of used Inodes", labels, nil), | ||
| getValue: func(fs *statsapi.FsStats) *float64 { return uint64ToFloat64(fs.InodesUsed) }, | ||
| }, | ||
| { | ||
| desc: prometheus.NewDesc(prometheus.BuildFQName(namespace, subsystem, "limit_bytes"), "Number of bytes that can be consumed by the container on this filesystem", labels, nil), | ||
| getValue: func(fs *statsapi.FsStats) *float64 { return uint64ToFloat64(fs.CapacityBytes) }, | ||
| }, | ||
| { | ||
| desc: prometheus.NewDesc(prometheus.BuildFQName(namespace, subsystem, "usage_bytes"), "Number of bytes that are consumed by the container on this filesystem", labels, nil), | ||
| getValue: func(fs *statsapi.FsStats) *float64 { return uint64ToFloat64(fs.UsedBytes) }, | ||
| }, | ||
| { | ||
| desc: prometheus.NewDesc(prometheus.BuildFQName(namespace, subsystem, "available_bytes"), "Number of bytes that not consumed", labels, nil), | ||
| getValue: func(fs *statsapi.FsStats) *float64 { return uint64ToFloat64(fs.AvailableBytes) }, | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| var ( | ||
| rootfsMetrics = generateFsStatsDescs("container", "fs", []string{"namespace", "pod", "pod_uid", "container"}) | ||
| ephemeralStorageMetrics = generateFsStatsDescs("ephemeral_storage", "pod", []string{"namespace", "pod", "pod_uid"}) | ||
| ) | ||
|
|
||
| func init() { | ||
| registerCollector("kubelet_stats_summary", NewKubeletStatsSummaryCollector) | ||
| } | ||
|
|
||
| type kubeletStatsSummaryCollector struct { | ||
| client *http.Client | ||
| } | ||
|
|
||
| func (c *kubeletStatsSummaryCollector) Update(ch chan<- prometheus.Metric) error { | ||
| resp, err := c.client.Get(kubeletStatsSummaryUrl) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer resp.Body.Close() | ||
| if resp.StatusCode != http.StatusOK { | ||
| body, _ := io.ReadAll(resp.Body) | ||
| return fmt.Errorf("failed to get kubelet stats summary: %d: %q", resp.StatusCode, string(body)) | ||
| } | ||
| var summary statsapi.Summary | ||
| if err := json.NewDecoder(resp.Body).Decode(&summary); err != nil { | ||
| return err | ||
| } | ||
| for _, pod := range summary.Pods { | ||
| for _, m := range ephemeralStorageMetrics { | ||
| metric := m.Metric(pod.EphemeralStorage, pod.PodRef.Namespace, pod.PodRef.Name, pod.PodRef.UID) | ||
| if metric != nil { | ||
| ch <- metric | ||
| } | ||
| } | ||
|
|
||
| for _, container := range pod.Containers { | ||
| for _, m := range rootfsMetrics { | ||
| metric := m.Metric(container.Rootfs, pod.PodRef.Namespace, pod.PodRef.Name, pod.PodRef.UID, container.Name) | ||
| if metric != nil { | ||
| ch <- metric | ||
| } | ||
| } | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func NewKubeletStatsSummaryCollector() (Collector, error) { | ||
| config := &transport.Config{ | ||
| UserAgent: rest.DefaultKubernetesUserAgent(), | ||
| TLS: transport.TLSConfig{ | ||
| // kubelet cert SANs do not contains localhost or 127.0.0.1 | ||
| Insecure: true, | ||
| }, | ||
| BearerTokenFile: saTokenFile, | ||
| } | ||
| tr, err := transport.New(config) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| collector := &kubeletStatsSummaryCollector{ | ||
| client: &http.Client{ | ||
| Transport: tr, | ||
| Timeout: kubeletHttpTimeout, | ||
| }, | ||
| } | ||
| return collector, nil | ||
| } |
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