Manual:$wgExemptFromUserRobotsControl

Robot policies: $wgExemptFromUserRobotsControl
An array of namespace keys in which the __INDEX__/__NOINDEX__ magic words will not function.
Introduced in version:	1.14.0
Removed in version:	still in use
Allowed values:	array of integers
Default value:	null

Other settings: Alphabetical | By Function

Details

An array of namespace keys in which the __INDEX__/__NOINDEX__ magic words will not function, so users can't decide whether pages in that namespace are indexed by search engines. If set to null, default to $wgContentNamespaces.

Example:

 $wgExemptFromUserRobotsControl = array( NS_MAIN, NS_TALK, NS_PROJECT );