ClusterNotUpgradeable and AdminAckRequired in OCP 4.8

Solution Verified - Updated -

Issue

  • A ClusterNotUpgradeable alert is shown in an OCP 4.8 cluster, with reason AdminAckRequired:

    One or more cluster operators have been blocking minor version cluster upgrades for at least an hour for reason AdminAckRequired.

  • Trying to upgrade from OCP 4.8 to OCP 4.9 fails with an error:

    Upgradeable=False

    Reason: AdminAckRequired
Message: Kubernetes 1.22 and therefore OpenShift 4.9 remove several APIs which require admin consideration. Please see
the knowledge article https://access.redhat.com/articles/6329921 for details and instructions.

Environment

  • Red Hat Openshift Container Platform (RHOCP)
    • 4.8

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