Hi! I just noticed that build-farm-url.el refers to deprecated/outdated URLs: hydra.gnu.org, ci.guix.info, etc.
As I’m writing this :-), I also notice that build-farm.el is technically not part of Emacs-Guix (and it supports Hydra too), but perhaps it should? The Cuirass JSON API is being expanded these days so it may be useful to revive this code. Ludo’.