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Parse Prometheus text format from proxy /metrics endpoints using expfmt, store snapshots in per-instance ring buffers (~1h retention at 10s intervals), compute per-second rates from counter deltas (handling resets), compute p50/p95/p99 from histogram buckets via linear interpolation, and expose results via REST API (GET /api/metrics/{id}, GET /api/metrics/fleet).
New admin/metrics package: parser, ring buffer, rate/percentile math, and Collector orchestrator. Poller extended to scrape /metrics on successful health probes. Fleet endpoint aggregates KPIs across instances with trend indicators vs 1h ago.
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