on https://fly-metrics.net/dashboards i see "Fly App", "Fly Instance", etc. <img width="847" height="194" alt="Image" src="https://github.com/user-attachments/assets/6a8c6a95-c6a2-4d1c-83d7-c93bcd3698c8" /> context: I'm trying to upstream a metric that tracks the root volume available space on Fly Instances (since we accidentally blew out ours)