Job rejected because of resource class

Today, out of nowhere, all our jobs started failing with

Job was rejected because resource class medium.gen2, image ubuntu-2604:current is not a valid resource class

Switching the image to ubuntu-2604:edge unblocked us, but I wonder why this happened in the first place.

Thanks for reporting this. Jobs using the ubuntu-2604:current image were affected. We identified and resolved the issue the same day so you should be able to use ubuntu-2604:current again. If you’re still seeing problems, please reply here or open a support ticket.

For us jobs failed with the exact error just today again: “Job was rejected because resource class large, image ubuntu-2604:current is not a valid resource class”.
Switched to the “edge” tag instead of “current” for now, and it works.