Just had another server have a MySQL server randomly stop. Still trying to track the reason down.
My problem server hasn't had another shutdown yet, all servers going good. The only thing I changed since the last shutdown was log rotating postfix, and disabling screenshots. It's a big mystery.
twest
Most likely it was a spike caused by a user running a bloated WordPress theme or plugin with stupid queries that heavily abuses MySQL. These kinds of issues are a pain in the neck to troubleshoot and can stay quiet for a week or two, then suddenly resurface. Best to review and optimize your MySQL settings to reduce the risk of it happening again.