From Test-Scratch-Wiki
This page lists tracking categories which are automatically populated by the MediaWiki software. Their names can be changed by altering the relevant system messages in the MediaWiki namespace.
| Tracking category | Message name | Category inclusion criteria | 
|---|---|---|
| Pages with broken file links | broken-file-category | The page contains a broken file link (a link to embed a file when the file does not exist). | 
| Pages using duplicate arguments in template calls | duplicate-args-category | The page contains template calls that use duplicates of arguments, such as {{foo|bar=1|bar=2}}or{{foo|bar|1=baz}}. | 
| Pages where expansion depth is exceeded | expansion-depth-exceeded-category | The page exceeds the maximum expansion depth. | 
| Pages with too many expensive parser function calls | expensive-parserfunction-category | The page uses too many expensive parser functions (like #ifexist). See Manual:$wgExpensiveParserFunctionLimit. | 
| Hidden categories | hidden-category-category | The category contains __HIDDENCAT__in its page content, which prevents it from showing up in the category links box on pages by default. | 
| Indexed pages | index-category | The page has a __INDEX__on it (and is in a namespace where that flag is allowed), and hence is indexed by robots where it normally wouldn't be. | 
| Pages where node count is exceeded | node-count-exceeded-category | The page exceeds the maximum node count. | 
| Noindexed pages | noindex-category | The page is not indexed by robots because it has the magic word __NOINDEX__on it and is in a namespace where that flag is allowed. | 
| Pages with non-numeric formatnum arguments | nonnumeric-formatnum | The page contains a non-numeric argument to the formatnum parser function. | 
| Pages containing omitted template arguments | post-expand-template-argument-category | The page is bigger than $wgMaxArticleSizeafter expanding a template argument (something in triple braces, like{{{Foo}}}). | 
| Pages where template include size is exceeded | post-expand-template-inclusion-category | The page size is bigger than $wgMaxArticleSizeafter expanding all the templates, so some templates were not expanded. | 
| Pages with ignored display titles | restricted-displaytitle-ignored | The page has an ignored {{DISPLAYTITLE}}because it is not equivalent to the page's actual title. | 
| Pages which use = as a template | template-equals-category | The page contains {{=}}but on this wiki that does not expand to=. This usage is deprecated; a future MediaWiki version will implement{{=}}as a parser function. | 
| Pages with template loops | template-loop-category | The page contains a template loop, ie. a template which calls itself recursively. | 
| Pages where the unstrip depth limit is exceeded | unstrip-depth-category | The page exceeds the unstrip depth limit. | 
| Pages where the unstrip size limit is exceeded | unstrip-size-category | The page exceeds the unstrip size limit. | 
| Pages with reference errors | cite-tracking-category-cite-error | Pages in this category have errors in the usage of references tags. | 
| Pages with math errors | math-tracking-category-error | Pages in this category have errors in the usage of math tags. | 
| Pages with math render errors | math-tracking-category-render-error | Pages in this category have rendering errors in the math tags. | 
| Pages that use a deprecated format of the chem tags | math-tracking-category-mhchem-deprecation | Pages in this category use a deprecated format of the chem tags | 
| Pages that use a deprecated format of the math tags | math-tracking-category-texvc-deprecation | Pages in this category use a deprecated format of the math tags | 
 
			