_rolling_upgrade_troubleshoot_node_error
If a node’s status transitions to Error, it means something went wrong during the upgrade. You can’t finish the rolling upgrade if any node has an Error status. However, you can still disable Upgrade mode as long as the cluster status is still Ready to upgrade.
There are several ways to address this:
Shut down Confluence gracefully on the node. This should disconnect the node from the cluster, allowing the node to transition to an Offline status.
If you can’t shut down Confluence gracefully, shut down the node altogether.
Once all active nodes are upgraded with no nodes in Error, you can finalize the rolling upgrade. You can investigate any problems with the problematic node afterwards and re-connect it to the cluster once you address the error.