After 6 years I finally messed up this server in a way that I don't seem to be able to recover - partly my fault, but also partly due the booting logic that Scaleway used on this (now deprecated) instance type.
I was already constantly running out of memory anyway, so this might be a good time to upgrade. Still, just a heads up that federation with this instance might be a bit bumpy during the next week.
And the migration is now complete (I think, hope I didn't forget anything )!
There are still some things to iron out (as I decided to migrate from nginx to traefik), but I'm pretty happy with the result. I might do a small writeup later.