If that's true and GitHub doesn't send mails for this particular thing, even it sends mails for more or less anything else if you don't disable it, paired with the fact that such a change is almost invisible if you don't know what to look for, makes it even more suspicious.
If there where changes post MS acquisition of GH to this parts this would look like planed long hand.
I'm curious about this too. I was told (by someone at GitHub) that the features I used to do the move are brand new and were not expected to be used the way I did. It is very possible pieces are missing in the audit trail GitHub creates.
Meh. I might be more interested if I actually had a GitHub Enterprise myself.
If there where changes post MS acquisition of GH to this parts this would look like planed long hand.