Goal: Provide administrators leveraging external monitoring and dashboard systems insight into the quota setting and attainment of organizations and repositories inside Quay based on Prometheus metrics.

Background: Customers with large Quay deployments tend to have custom dashboards to monitor the registry, which is more effective and customizable than using the Quay UI. Those customers currently don't have any insight into the storage quota system.

Deliverables:

Prometheus metrics covering quota consumption per organization and separately per repository:

• quota consumption per organization: capacity_/available_bytes
• quota consumption per repository: capacity_/available_bytes

This follows the Kubernetes storage subsystem metric schema, for example: kubelet_volume_stats_capacity_bytes/_available_bytes.