After updating the MySQL server this morning, it wouldn't start again because it failed to parse the MySQL server configuration file. After checking the configuration it appeared that it had been overwritten with configurations from a different application. I didn't have any backups of the configuration and it doesn't run on default settings so I had to wait for Kornholijo to fix it. He was unavailable for ~12 hours and that's why there was a long downtime. I'll make sure we backup the configuration files too now, so next time if something like this happens I shouldn't have to wait for Kornholijo to become available to address it. Sorry for the downtime.