Prometheus not able to read etcd metrics after upgrade in OCP 3

Solution Verified - Updated -

Issue

  • After a cluster Openshift minor version upgrade, Prometheus is no longer able to read etcd metrics. Also, Etcd targets are shown as "DOWN" in Prometheus UI:

etcd endpoints down

  • The etcd monitoring targets are down with x509: certificate signed by unknown authoritymessage on Prometheus GUI.

Environment

Red Hat OpenShift Container Platform (RHOCP) 3.11

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