Attempting to upgrade a ROSA cluster from 4.12 to 4.13 before making the administrator acknowledgement for deprecated Kubernetes APIs causes the upgrade to hang indefinitely. https://docs.redhat.com/en/documentation/openshift_container_platform/4.13/html/updating_clusters/updating-cluster-prepare#update-preparing-ack_updating-cluster-prepare

4.12  

    1. Initiate ROSA cluster upgrade from 4.12 to 4.13 without performing acknowledgement.
    2. Observe that the cluster gets stuck and never upgrades, even after making the admin acks and the Managed Upgrade Operator times out.
    

Cluster gets stuck here:

NAME                     DESIRED_VERSION   PHASE       STAGE                 STATUS   REASON                         MESSAGE
managed-upgrade-config   4.13.48           Upgrading   IsClusterUpgradable   False    IsClusterUpgradable not done   Cluster upgrade to version 4.13.48 on Fri Sep  6 16:09:52 UTC 2024 has been cancelled: MultipleReasons: Cluster should not be upgraded between minor versions for multiple reasons: AdminAckRequired,Degraded    

Cluster upgrades successfully after admin acknowledgement is made like this:

$ oc -n openshift-config patch cm admin-acks --patch '{"data":{"ack-4.12-kube-1.26-api-removals-in-4.13":"true"}}' --type=merge

Only workaround at the moment is for SRE to manually cancel the upgrade and try again.