Help:Tracking categories

Tracking categories is a feature of MediaWiki which allows pages with certain characteristics to be tracked. It works by adding any such page to a category automatically.

Since 1>Special:MyLanguage/MediaWiki 1.23|MediaWiki 1.23, tracking categories are listed in the  configuration variable, and can be viewed on Special:TrackingCategories. Since MediaWiki 1.25, tracking categories, which are added by MediaWiki itself, are hard-coded in the MediaWiki source code, and  is kept for backwards compatibility.

What category to use is determined by the tracking category's 1>Special:MyLanguage/Help:System message|system message, that is, a page in MediaWiki namespace. If the message is a single hyphen-minus (-), then the tracking category is disabled. Often wiki admins mark such categories as hidden (using the   magic>Special:MyLanguage/Help:Magic words|magic word), since they are meant for maintenance and not general consumption. Some sites use  to modify which category is used based on namespace, but that doesn't work properly until 1.19.

Some wikis add custom tracking categories via some hacks, for instance 1>w:it:Categoria:Pagine con errori nelle espressioni|this category, which tracks pages with  #expr  errors, added through the 3>w:it:Special:PrefixIndex/MediaWiki:Pfunc expr</>|relevant errors shown on such pages.

Core
The following tracking categories are added by MediaWiki itself, or have been in the past.

Extensions
The following tracking categories are added by extensions, or have been in the past. Extensions can add new tracking categories using the. Prior to 1.25, this was instead done via <tvar|1></>, with the tracking category name added to <tvar|2></>.