That would be the CentralNotice[1] extension. although, If it just a single wiki you can just use a SiteNotice[2].
[1]. https://www.mediawiki.org/wiki/Extension:CentralNotice [2]. https://www.mediawiki.org/wiki/Manual:Interface/Sitenotice _______________________________________________ MediaWiki-l mailing list [email protected] https://lists.wikimedia.org/mailman/listinfo/mediawiki-l
