Just now the toolsdb database server ran out of memory and died[0] -- it took us a few minutes to get things rolling again but all service should be restored.
The service first went down Aug 15 23:09:12; RO only service was restored about 45 minutes later and RW service shortly after that.
Probably no action is needed on the part of tool maintainers, but if your tools are upset this is a good thing to suspect. Sorry for the downtime!
-Andrew + the WMCS team
cloud-announce@lists.wikimedia.org