I've googled "all changes" "any changes", "all modifications", etc. in the context of Mediawiki notifications and come up with nothing -- not even perennial requests -- for my use case:
There is an old wiki that is not undergoing much of any activity that I'm trying to revive in the manner of a wiki project or wiki task force and one of the best ways to keeping the team active would be for everyone on the team to be notified of everything that is happening to the wiki.
This seems like an obvious feature but I can't find how to enable notification for all changes to the wiki.