CODEWITHSUNDEEP
kubernetesmetrics
Shahed
Shahed

Reputation: 109

Difference between k8s /metrics endpoint in Kubelet vs APIServer

I am trying to understand the difference between the metrics returned from the /metrics endpoint on the API Server vs Kubelet.

Both seem to return similar metrics, however the apiserver has metrics for Etcd which are missing on Kubelet which makes sense.

However, I am not sure if the Kubelet /metrics endpoint is actually pulling its info from the apiserver or if its the other way around? Or perhaps each maintains its own set of metrics?

Upvotes: 2

Views: 146

Answers (1)

PatickM
PatickM

Reputation: 21

The /metrics endpoint at kubelet is exposed by the kubelet itself. Kubelet collects the metrics information from the node it is running. Relevant information can be found in the k8s documentations(https://kubernetes.io/docs/concepts/cluster-administration/system-metrics/).

Metrics in Kubernetes.

When calling the /metrics called at api-server, it will collect information from all relevant components, including the /metrics from kubelet, which can be shown in the Resource metrics pipeline(https://kubernetes.io/docs/tasks/debug/debug-cluster/resource-metrics-pipeline/#:~:text=The%20metrics%2Dserver%20calls%20the,metrics%2Fresource%20in%20version%20v0.).

Resource metrics pipeline.

Go back to your question, kubelet on each node expose /metrics endpoint, the statistics from which are maintained by kubelet itself.

Upvotes: 1

Related Questions