mysql not restarting after server reboot

Not sure where the best place to get assistance with this is, here or with Forge who provisioned the server, but maybe someone here has some experience.

My server has recently restarted, and when it did, mysql won't restart.

I'm getting the following error

Job for mariadb.service failed because the control process exited with error code.
See "systemctl status mariadb.service" and "journalctl -xe" for details.

Thought I was over the past issue , but now this! Argh.

Any thoughts on how to debug?