Hello,
The Gerrit 3.5 upgrade did not work as expected. The disk partition filed up due to some disk backed caches filing it which broke the service.
Giuseppe and Clément stepped in to create a new disk partition and relocate the Gerrit files to the new partition. We restarted Gerrit at 11:45 UTC and it is running version 3.5.4.
The follow up task for the disk space issue is: https://phabricator.wikimedia.org/T323262
I have created a place holder incident report: https://wikitech.wikimedia.org/wiki/Incidents/2022-11-17_Gerrit_3.5_upgrade