Manual:$wgExemptFromUserRobotsControl

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

Details

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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 = [ NS_MAIN, NS_TALK, NS_PROJECT ];

Or, to switch it off entirely:

$wgExemptFromUserRobotsControl = [];