Today I noticed that the QA webpage was 502 on bayfront. I restarted qa-frontpage and bffe without problem. When trying to do "herd restart nginx", the command did not show any output and did not come back. Moreover, "herd status" also hang without any output.
I could still ssh into the machine and then, thanks to Ludovic, reboot with the magic command guix shell guile shepherd -- guile -c '(use-modules (shepherd system)) (sync) (reboot-kexec)' Andreas
