Fix storage sizes in observable for origins (no more prometheus data)
Current query for origins storage size relies on the k8s reporting mounted folder size. Since we switched to using block devices, the filesystems are not anymore mounted directly on the node, and are instead mounted inside the pods. We don't have visibility into the size anymore.
I asked @biozit how we could query the origin size otherwise, but seems like we can not...
This is all about https://observablehq.com/d/f2f8ca16077504f1 and https://observablehq.com/d/9179e93434550eeb dashboards. 2 out of 3 still work, but this will break once the folders are unmounted (and they will be)