Affects Version/s: 2.1.X CE, 2.1.X EE
Steps to reproduce.
Log in as UserA and add a wiki page
Add a comment to the wiki page
Verify that activities show that UserA added a comment to the wiki page.
Log in as User B
Add a comment to the wiki, or to the activity showing user A added a comment.
UserB and 1 other added a comment to wiki page
UserA and 1 other added a comment to wiki page.
Since these group over time, we would expect the most recent user to be reflected in the activity and other users to click on the "comments" link to view previous comments.