You need to seek community consensus, or at least bring it up within the community, for this sort of request.

See [[m:Requesting wiki configuration changes]].

Here: https://it.wikivoyage.org/wiki/Wikivoyage:Lounge#Conteggio_articoli you can find the discussion for it:voy.

I've asked de:voy to do the same. In the meanwhile you can proceed with it:voy.

Change 89496 had a related patch set uploaded by TTO:
Add Portale namespace to wgContentNamespaces for itwikivoyage

https://gerrit.wikimedia.org/r/89496

Change 89496 merged by jenkins-bot:
Add Portale namespace to wgContentNamespaces for itwikivoyage

https://gerrit.wikimedia.org/r/89496

Now done for itwikivoyage; pending consensus for dewikivoyage.

Thanks for the patch on it:voy; I've just informed de:voy to apply for community consensus.

In the meanwhile, I'd like to ask you a question. I've noticed that in it:voy exists 20 (non redirect) pages on the NS Portale, but after the patch I've seen just a +5 on the NUMBEROFARTICLES. Do you know why?

stefan wrote:

Not enough participants and no consesus on WV/de. You can keep it as it is and close this bug.

OK. Marking as fixed since the itwikivoyage half was solved.