Next Monday, November 25th, at around 13:00 UTC, ToolsDB will be upgraded from MariaDB v10.4.29 to MariaDB v10.6.19. [0]
I have already created a new host "tools-db-4" that is running the new version, and is replicating from the current primary. On Monday, I will fail over the current primary to the new host. [1]
All connections will be dropped and the DNS will be updated to point to the new host. Tools should automatically reconnect to the new host. No downtime is expected but there will be a few minutes of read-only time.
For most tools, the upgrade should be painless. However, you might want to check the official docs listing incompatible changes introduced in version 10.5 [2] and 10.6. [3]
If you find any issues, please let us know in the #wikimedia-cloud IRC channel.
[0] https://phabricator.wikimedia.org/T352206 [1] https://wikitech.wikimedia.org/wiki/Portal:Toolforge/Admin/ToolsDB#Failing_o... [2] https://mariadb.com/kb/en/upgrading-from-mariadb-10-4-to-mariadb-10-5/ [3] https://mariadb.com/kb/en/upgrading-from-mariadb-10-5-to-mariadb-10-6/