Extension:WarnNotRecentlyUpdated

The 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:
 * network/devops/SRE/operations/systems/infrastructure
 * legal content
 * fiscal content

Configuration parameters

 * $wgWarnNotRecentlyUpdatedDelay: the delay in seconds for a page to be considered fresh; by default, 31 536 000 seconds (one year)
 * $wgWarnNotRecentlyUpdatedPages: an array of pages prefix by namespace where the warning should apply

Interface parameters
The  configuration parameter makes references to the interface messages. Those messages are displayed if the page belongs to one of the prefixes and has been updated a greater delay than configured.