From Meta, a Wikimedia project coordination wiki

[edit] This extension allows administrators to create and edit banner campaigns across multiple wikis. Documentation can be found at Help:CentralNotice.

Please add potential notices to the CentralNotice calendar and discuss potential changes with the project sponsor prior to making them. See also the CentralNotice usage guidelines and banner guidelines.

Current cache settings: Banners: 10min server, 0min client; Geo: 0min. Note: Campaigns are not cached - rather, banners assigned to campaigns are cached.

Testing: The Afar Wikipedia (aawiki) and many others have been closed, but are still live and can be targeted from CentralNotice campaigns. Alternately you can test on but note that it runs a completely separate instance of CentralNotice.

Emergencies: Any urgent issue regarding any ongoing campaign or live banner should be reported to #wikimedia-fundraisingconnect or jseddon(_AT_)