The eqiad / codfw have 20 / 15 G disks respectively, and we are running tight as the grafana database grows (or even if we need to take a backup like T384840).

We're not going to reimage / reinstall these VMs anytime soon, therefore I think the easiest is to increase their disk space to say 50G as per https://wikitech.wikimedia.org/wiki/Ganeti#Adding_disk_space