At 06:15:06Z the MySQL server on this host shut down. When it came back up, it didn’t recognize the password for my database user.

 

Going back in there and resetting the password restored everything.

 

There are… pretty much no clues as to what happened in there. I’m not seeing any signs of intrusion or anything (for once!)… I’m thinking…. gremlins.

 

Carry on then.