Related to https://github.com/jupyterhub/mybinder.org-deploy/issues/3285 Related to https://github.com/jupyterhub/mybinder.org-deploy/issues/3601 "Federation health" visualisation in Grafana was showing the GESIS server as health when it was completely down due to out of memory. <img width="1588" height="448" alt="Image" src="https://github.com/user-attachments/assets/241ade34-abe1-4f28-b5ab-4d18a050d869" /> We should revisit the query used for the "Federation health" visualisation. <img width="1273" height="477" alt="Image" src="https://github.com/user-attachments/assets/8296297a-5bce-4d5e-af61-758232a5e4f3" />
