Last modified: 2014-05-21 20:40:36 UTC
During several tests with wiki pages, whether or not __NOINDEX__ is honored or ignored, appeared to be random, consistently reproducible per page, and independent of the page content. In page: https://wiki.piratenpartei.de/NRW:Rhein-Erft-Kreis/Kreisb%C3%BCro it seems to be always ignored. In page: https://wiki.piratenpartei.de/wiki/index.php?title=Benutzer-Purodha-test2&oldid=2337123 it seems to be always ignored as well, while in another page having identical content: https://wiki.piratenpartei.de/wiki/index.php?title=Benutzer-Purodha-test&oldid=2337117 it seems to always behave as expected.
Update: Now, the last page mentioned above has changed its behaviour and does not honor __NOINDEX__ any more. Since the page hade been moved, and for a while (many minutes, but less than half an hour) kept its old behavior after the move, I believe that this could have been due to caching. Yet I do not know enough about the actual caching in this wiki so as to be sure about it. Thus one may now guess that the behavior of __NOINEX__ may depend on the full page title - or anything else.
Astonishingly, only user pages appear to be listed in category of NOINDEXed pages of the wiki: https://wiki.piratenpartei.de/wiki/index.php?title=Kategorie:Nichtindexierte_Seiten
Haven't checked carefully but what's your [[mw:Manual:$wgExemptFromUserRobotsControl]]?
NOINDEX is not working on content namespaces, you can override it with $wgExemptFromUserRobotsControl as Liangent wrote. So WORKSFORME
Seems to be working as documented
