Hi.
I'm on the Wikimedia Phabricator, and today, one of my team members was running a script to migrate our Mingle instance into Phabricator. Great idea, and I'm glad we did it.
Tonight, I was on my VPS, which hosts several things including my email accounts. It was reporting "disk quota exceeded" errors on just about every attempt to create or edit a file.
I later discovered about three thousand files in my directory holding Phabricator emails. Understandable, given the volume of changes we'd been experiencing. I deleted them all. Things are working again.
We've hypothesized about configuring Phabricator to batch notifications in case of immense volume, and I think it's time to seriously consider that option, because this is clearly an issue.