[ovirt-users] Cluster stuck in maintenance - Hosts not upgrading as expected

I have a 3-node hyperconverged cluster with Gluster filesystem running on RHEL 8.3 hosts. It's been stable on oVirt 4.5. Today, I just upgraded the Engine to v4.6. [Screenshot from 2021-05-22 20-29-23.png] I then logged into the oVirt manager, navigated to Compute -> Clusters, and clicked on Upgrade. The Status of the cluster does have an exclamation mark that says "Upgrade Cluster Compatibility Level", but my understanding is, I shouldn't do that until all 3 of my hosts have been upgraded. Looking at active tasks, I see that the first host in my cluster is stuck in "Upgrading". It's now been like this for 3 hours, without any visible progress. If I try to launch a VM that is not configured for high availability, the VM fails to launch, and I get a message about the cluster being in "Maintenance Mode" and that none of the hosts satisfies current scheduling restraints. How do I.... a) Cancel / clear the upgrade and take the cluster out of "maintenance mode" b) Properly upgrade the cluster, since clicking the "Upgrade" button clearly didn't work? Thanks, David  Sent with ProtonMail Secure Email.