# Capacity planning dashboard spec

- **RU utilization**: Per site, sum of assigned positions vs total RU (from racks); show percentage. **Implemented.** API: `GET /api/v1/capacity/sites/:siteId` returns `usedRu`, `totalRu`, and `utilizationPercent`.
- **Power headroom**: From rack `power_feeds` (circuit limits). **Implemented.** API: `GET /api/v1/capacity/sites/:siteId/power` returns `circuitLimitWatts`, `measuredDrawWatts` (null until Phase 4), `headroomWatts` (null). Measured draw can be added when telemetry is available.
- **GPU inventory**: By type (part number) and location. **Implemented.** API: `GET /api/v1/capacity/gpu-inventory` returns `total`, `bySite`, and `byType`.
- **Read-only**: All capacity endpoints are read-only; no edits.
- **Web**: Capacity dashboard at `/capacity` shows RU utilization, power headroom, and GPU inventory by site and type.