It looks like this template is missing the option to like to the bug tracker for non-wmf extensions? If yes, it will be cool if someone could add it.
Topic on Template talk:Extension
Do you mean, non-Wikimedia-hosted extensions? There are ~190 extensions used in Wikimedia production and ~2000 in gerrit/Phabricator, but you're right that not all of them use that.
Yeah, I meant everything that is not in Gerrit and does not use Phabricator, i.e., extensions hosted on GitHub, GitLab, Bitbucket, private Git instances, etc.
Triggering this is a new bug report of today in Phabricator for Extension:Semantic_Drilldown, even though GitHub is advertised as the bug tracker. The info is at the very bottom of that page and not in the spot where most people are used to finding the link. We may probably want to help these creatures of habit. I guess I am one of them, too. ;)