Good morning, I have to perform some scheduled maintenance on one of the analytics MariaDB replicas <https://wikitech.wikimedia.org/wiki/Analytics/Systems/MariaDB> next week under ticket T343109 <https://phabricator.wikimedia.org/T343109>. Specifically, this is the replica we have of the s2 shard <https://noc.wikimedia.org/conf/highlight.php?file=dblists/s2.dblist>, which is accessible through the s2-analytics-replica.eqiad.wmnet alias. I have to rebuild this shard from a backup as a preventative measure. I expect this shard to be unavailable for *a few hours* next *Tuesday October 24th*, starting from approximately *09:30 UTC*, whilst the rebuild is taking place. This downtime may affect you if you: * Use the analytics-mysql <https://wikitech.wikimedia.org/wiki/Analytics/Systems/MariaDB#MySQL_wrapper> wrapper from stats servers * Use the wmfdata-python <https://github.com/wikimedia/wmfdata-python> or wikimedia-discovery-wmf <https://github.com/wikimedia/wikimedia-discovery-wmf> libraries to read from the analytics replicas Please let me know if this maintenance window will adversely affect your work and I will try to reschedule it. If you have any questions or comments, please don't hesitate to get in touch. Kind regards, Ben -- *Ben Tullis*(he/him) Senior Site Reliability Engineer Wikimedia Foundation <https://wikimediafoundation.org/>