We have Ganeti clusters availabile in PoPs now, thus we should move Prometheus to a Ganeti VM and off the bastions.
Outline of steps per site:
- Provision Prometheus VM (8GB ram / 128GB disk to start with)
- Add VM hostname to prometheus_nodes
- Stop prometheus on bastion and VM + rsync /srv/prometheus bastion -> VM + restart Prometheus on VM and bastion
- Flip DNS name prometheus.svc to point to the VM
- Reimage bastion