WarnNotRecentlyUpdated extension checks the last modified date of content pages and print a warning if the page is older than a specific delay. The intent is to be used for manuals/checklists/documentation for teams where information is known to rot quickly, and where there is a very good chance information older than a certain age can be legacy or are dangerous to trust like network/devops/SRE/operations/systems/infrastructure, legal content or fiscal notes.

https://www.mediawiki.org/wiki/Extension:WarnNotRecentlyUpdated