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Fix and improve comments on kubelet metrics

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This commit is contained in:
Yuan Chen 2021-10-21 13:42:59 -07:00
parent d3350f45e5
commit b99495d1d9
2 changed files with 8 additions and 6 deletions
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5
pkg/kubelet/kubelet.go
View File

@ -1542,7 +1542,7 @@ func (kl *Kubelet) syncPod(ctx context.Context, updateType kubetypes.SyncPodType
defer klog.V(4).InfoS("syncPod exit", "pod", klog.KObj(pod), "podUID", pod.UID)
// Latency measurements for the main workflow are relative to the
// first time the pod was seen by the API server.
// first time the pod was seen by kubelet.
var firstSeenTime time.Time
if firstSeenTimeStr, ok := pod.Annotations[kubetypes.ConfigFirstSeenAnnotationKey]; ok {
firstSeenTime = kubetypes.ConvertToTimestamp(firstSeenTimeStr).Get()
@ -1601,7 +1601,8 @@ func (kl *Kubelet) syncPod(ctx context.Context, updateType kubetypes.SyncPodType
}
}
// Record the time it takes for the pod to become running.
// Record the time it takes for the pod to become running
// since kubelet first saw the pod if firstSeenTime is set.
existingStatus, ok := kl.statusManager.GetPodStatus(pod.UID)
if !ok || existingStatus.Phase == v1.PodPending && apiPodStatus.Phase == v1.PodRunning &&
!firstSeenTime.IsZero() {

9
pkg/kubelet/metrics/metrics.go
View File

@ -132,12 +132,13 @@ var (
},
[]string{"operation_type"},
)
// PodStartDuration is a Histogram that tracks the duration (in seconds) it takes for a single pod to go from pending to running.
// PodStartDuration is a Histogram that tracks the duration (in seconds) it takes for a single pod to run since it's
// first time seen by kubelet.
PodStartDuration = metrics.NewHistogram(
&metrics.HistogramOpts{
Subsystem: KubeletSubsystem,
Name: PodStartDurationKey,
Help: "Duration in seconds for a single pod to go from pending to running.",
Help: "Duration in seconds from kubelet seeing a pod for the first time to the pod starting to run",
Buckets: metrics.DefBuckets,
StabilityLevel: metrics.ALPHA,
},
@ -154,12 +155,12 @@ var (
},
[]string{"operation_type"},
)
// PodWorkerStartDuration is a Histogram that tracks the duration (in seconds) it takes from seeing a pod to starting a worker.
// PodWorkerStartDuration is a Histogram that tracks the duration (in seconds) it takes from kubelet seeing a pod to starting a worker.
PodWorkerStartDuration = metrics.NewHistogram(
&metrics.HistogramOpts{
Subsystem: KubeletSubsystem,
Name: PodWorkerStartDurationKey,
Help: "Duration in seconds from seeing a pod to starting a worker.",
Help: "Duration in seconds from kubelet seeing a pod to starting a worker.",
Buckets: metrics.DefBuckets,
StabilityLevel: metrics.ALPHA,
},