We've been using a herald rule that emails a mailing list each time a commit occurs.
Since yesterday, the emails have stopped. There have been no changes to Phabricator or the machine hosting it.
Other Phabricator emails, such as Differential emails, as well as a personal Herald rule for Differential, are working fine.
I've already tried restarting the daemons via `phd` and that didn't fix it.