prometheus-k8s pods are missing causing monitoring operator to be in a degraded state

Solution Verified - Updated -

Issue

  • Why monitoring operator is in a degraded state?
  • Why prometheus-k8s pods are missing from project openshift-monitoring?

  • Error is recorded in the events:

    prometheus-k8s failed error: PersistentVolumeClaim "prometheus-k8s-db-prometheus-k8s-0" is invalid: spec.resources[storage]: Required value

Environment

  • Red Hat Openshift Container Platform (RHOCP)
    • 4.x

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