When a mentor quits, they are replaced by another mentor; newcomers who had the mentor who left get a message.
At the moment, the message uses MediaWiki:Growthexperiments-quit-mentorship-reassign-mentees-log-message-removed
$2 removed $1 from mentorship
$1 - username of the previous mentor
$2 - username of the admin who removed the mentor
If the mentor is removed by another admin, the message is:
Reason: Jane removed Joe from mentorship
But the same message is used if Jane, acting as an admin, removes themselves from the list of mentors. Then the message shown is:
Reason: Jane removed Jane from mentorship
For a newcomer, the important information is that you have a new mentor. The reason why your old mentor left is not important and should be removed from the messages. The reason is kept in logs though.
When a mentor removes themselves from mentorship, or is removed by an admin, we should provide a more user-friendly message:
Your former mentor, $old_mentor, is no longer your mentor.
$new_mentor is your new mentor on $wiki.