How to collect etcd metrics in OpenShift 4.4 and higher?

Solution Verified - Updated -

Issue

  • How to identify disk operation latencies which often indicate disk issues and this may cause high request latency or make the cluster unstable.
  • How to collect the raw metrics exposed by etcd container ?
  • How to get some etcd metrics directly from etcd in the case that prometheus is failing?

Environment

  • Red Hat OpenShift Container Platform (RHOCP)
    • 4.4 and higher

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