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Document PodAndContainerStatsFromCRI feature

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Signed-off-by: Peter Hunt <pehunt@redhat.com>
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Peter Hunt
2021-11-22 15:19:46 -05:00
parent 6e45595d3a
commit 7c1e61a697
2 changed files with 12 additions and 0 deletions
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content/en/docs/tasks/debug-application-cluster/resource-metrics-pipeline.md
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@@ -65,3 +65,12 @@ Metrics Server collects metrics from the Summary API, exposed by
Learn more about the metrics server in
[the design doc](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/instrumentation/metrics-server.md).
### Summary API Source
The [Kubelet](/docs/reference/command-line-tools-reference/kubelet/) gathers stats at node, volume, pod and container level, and omits
them in the [Summary API](https://github.com/kubernetes/kubernetes/blob/7d309e0104fedb57280b261e5677d919cb2a0e2d/staging/src/k8s.io/kubelet/pkg/apis/stats/v1alpha1/types.go)
for consumers to read.
Pre-1.23, these resources have been primarily gathered from [cAdvisor](https://github.com/google/cadvisor). However, in 1.23 with the
introduction of the `PodAndContainerStatsFromCRI` FeatureGate, container and pod level stats can be gathered by the CRI implementation.
Note: this also requires support from the CRI implementations (containerd >= 1.6.0, CRI-O >= 1.23.0).