Hey,

With some prompting, there's now a blog post about the Guix Build
Coordinator: 

  https://guix.gnu.org/en/blog/2021/building-derivations-how-complicated-can-it-be/

Since it doesn't have a web interface like the Guix Data Service, and
doesn't directly meet a widespread need, I think it's probably harder
than usual to understand the intent and design , but hopefully this
helps.

Thanks to Ludo for his review and feedback.

Do let me know if you notice any mistakes or have any questions!

Chris