During the flurry of activity we had recently in diagnosing and fixing problems with the shared ToolsDB MariaDB service [0], we made a configuration change to place a hard limit on the maximum number of simultaneous connections permitted for each user account [1][2].
The current limit is set at 20 concurrent connections. This should not cause any problems for a typical webservice or single script using ToolsDB, but tools making heavy use of ToolsDB may need to make some adjustments.
As always, tool maintainers can seek advice on dealing with this limit or other issues in Toolforge from the Toolforge administration team and others in the community via our Freenode IRC channel (#wikimedia-cloud), Phabricator tasks, and the cloud@lists.wikimedia.org mailing list.
[0]: https://phabricator.wikimedia.org/T216208 [1]: https://phabricator.wikimedia.org/T216170 [2]: https://mariadb.com/kb/en/library/server-system-variables/#max_user_connecti...
Bryan, on behalf of the Toolforge administration team