# 5.14 — Prometheus metrics (GREEN)

Phase: 5 — Chat + Rate Limiter (Surface D)
Stage: GREEN

Depends on: [5.8](5.8-rate-limiting-tier3.md)

- [ ] Prometheus metrics: `atlas_chat_concurrent`, `atlas_chat_queue_depth`, `atlas_ratelimit_rejections_total`, `atlas_snapshot_age_seconds`