So around ~1312 my server that hosts services such as https://meetup-mf2.jvt.me and https://eventbrite-mf2.jvt.me/ but also my Micropub endpoint and other things restarted. Not 100% sure why (as it turns out that the logs didn't persist) but turns out that my webserver ( https://caddyserver.com/ ) hadn't been configured to restart post-boot, but all the other services had. Woops! Glad I didn't have a tonne of content to push, but it was a bit worrying having no way to resolve it, as I had no laptop to SSH and diagnose.