MySQL and related services still down

We’re still battling an issue we have yet to diagnose. At this point, we’re not expecting things to come back tonight. We’re working to move the services off the affected infrastructure to bring the critical services back. We’re getting outage pages into place for affected websites.
Once we’re through this, I’ll provide a detailed explanation of how things are set up and what went wrong for those who are interested in that. At the moment, we’re still struggling to figure out what exactly has gone wrong, since there’s no indication as to what’s causing the service failures.