Siavash Sameni e813362395 feat: federation metrics + dedup + rate limiting ...

Add Prometheus metrics for federation links (per-peer RTT, packet
counters, active rooms gauge, dedup/rate-limit drop counters).

Add dedup filter (4096-entry ring buffer) to drop duplicate packets
arriving via multiple federation paths. Add per-room token bucket
rate limiter (500 pps) to prevent amplification.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-08 10:36:26 +04:00

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