Or just stop using them completely? ;)

May be the question to ask is do we really need that?

I don't know any way to get the number of tried resolutions (or views) of a non-existent domain.

If someone find an old Wikimania website they may think the current website is wikimania2020.wikimedia.org

@Bugreporter: What does a namespace on a wiki have to do with a subdomain?

I am just here doing clinic duty for the Operations tag. Traffic should decide on this ticket, but based on my (limited) understanding of our setup, I suggest we should not do this unless there is a really good reason to.

@Bugreporter suggestion seems to be related to pageviews of wikimania2020 vs. other wikimanias, if that is the case probably the fix should be on analytics reporting per page or namespace, not on actual domain setup (and maybe that is even possible already). Please let us know what your needs are so maybe we can suggest a different way to achieve the same.

But again, I am not the person to decide, traffic should.

In T240341#5728007, @Bugreporter wrote:

If someone find an old Wikimania website they may think the current website is wikimania2020.wikimedia.org

So maybe first T202684#5735025 should be answered before we do anything here?