Generally this sounds fine to me, but please hold off on merging any changes that implement this for now, as I'm performing a quick investigation to see if there's some other cause for this.
I suppose so; I have no particularly strong feelings about this task myself, but it seems logical enough.
I figure we can try it, and revert if there is some issue caused by it. Let's add the User-notice tag and ping @Johan so that he can put it into Tech News; that way, people know to come here and ask for a revert if there's an issue.
This only concerns English Wikipedia, right? We try to avoid putting things that are only relevant to one wiki into Tech News as it's translated into 13–15 languages and goes out to a fair number of wikis, but I could manually add an update about this to all English Wikipedia community pages reached by Tech News when I send it out on Monday. Makes sense?
On English Wikipedia, that would be the technical village pump and Wikipedia:Tech news. The distribution list can be found here:
I could try to get it done on the next SWAT window but I am not sure whether it would be accepted on this week or the next. Since it's a simple config change, it might be allowed though.
Change has been deployed and the meta robots tag is now present on user ns pages. It could take anything from a few minutes to weeks for the changes to take effect on the search results though.