Hey all!
I realize that the 3.x release is no longer being supported/worked on, but hopefully this is either an easy fix or something someone else has run into.
We are currently running 3.4, and every time we attempt to upgrade to 3.5.x we encounter the error in the screenshot.
Manually restarting services does cause the GUI to show a green checkbox in the upgrade dialogue box, but upon rebooting, the upgrade never completes.
Is this a known error? Would hate to move to 4.x without being able to move our historical metrics with it, but we want to get current.