Phabricator stability

[Aaron Ballman via llvm-commits]

Just an FYI, but it seems like Phabricator may be having some issues
this weekend. When trying to perform reviews, a few folks have noticed
they get errors about insufficient space to save various internal
tables. Additionally, it seems that emails from submitted reviews are
not always being generated. It is possible that the machine is running
out of disk space, or otherwise needs some attention.

If a Phab admin is available to look into the server, that would be appreciated.

~Aaron