Hello,

We are planning to upgrade our Druid https://wikitech.wikimedia.org/wiki/Data_Platform/Systems/Druid cluster for analytics tomorrow morning (Wednesday 21st Jan 2026) at around 10:30 UTC. The work is being tracked in: T278056 Upgrade Druid to version 26.0.0 https://phabricator.wikimedia.org/T278056

We expect the work to take around 1 hour, during which there will be disruption to Turnilo https://wikitech.wikimedia.org/wiki/Data_Platform/Systems/Turnilo and any Superset https://wikitech.wikimedia.org/wiki/Data_Platform/Systems/Superset dashboards that read from Druid.

Please let us know if this will be highly inconvenient for you, for any reason. If this should be the case, then we can look to defer and re-schedule the upgrade.

If you have any queries or comments, please do get in touch.

Kind regards, Ben