Notification when a plugin, automated or manual, fails to update.
Rune Rasmussen
Super important. It's hardly visible now when anything fails on automated updates, and then you have to look through the logs to figure out which site and plugin it was (and still there is no info about why).
The mail and lack of clear notes for failed updates is a bit ironic, when compared to the red flags around in the system for everything else who is less important. ;)