High number of rolebindings causes HighOverallControlPlaneCPU alert in OpenShift 4

Solution Verified - Updated -

Issue

  • There is high CPU utilization of master nodes in the OpenShift 4 cluster.
  • The apiserver pods from openshift-apiserver namespace have high CPU utilization.
  • Total rolebindings count in the cluster is high:

    $ oc get rolebindings -A | wc -l
    4042
    

Environment

  • Red Hat OpenShift Container Platform (RHOCP)
    • 4

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