Board Thread:Support Requests - Getting Started/@comment-5716479-20130524192521/@comment-3335785-20130524205442

It doesn't show minor edits. I remember when users who automatically have their edits marked as minor mass edit the activity module can be completely empty (which I think causes some sort of bug). It would also exclude flagged bot edits to pages.

The documentation linked above would suggest that the help namespace is also included in what is shown, but it's not often edited with shared Wikia help.

Essentially, if the page contributes to the page total tally (usually shown on mainspace pages near the page header) then it will appear on the wiki activity module.