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WZP-P2-T5-S1: Relay Prometheus /metrics - RelayMetrics: active_sessions, active_rooms, packets/bytes_forwarded, auth_attempts (ok/fail), handshake_duration histogram - --metrics-port flag spawns HTTP server - Wired into auth, handshake, session, and packet forwarding paths - 2 tests WZP-P2-T5-S3: Web bridge Prometheus /metrics - WebMetrics: active_connections, frames_bridged (up/down), auth_failures, handshake_latency histogram - Added /metrics route to existing axum app - Wired into WS connect/disconnect, auth, handshake, send/recv loops - 2 tests WZP-P2-T5-S4: Client --metrics-file JSONL - ClientMetricsSnapshot with all telemetry fields - MetricsWriter: writes one JSON line per second to file - snapshot_from_stats() converts JitterStats to snapshot - --metrics-file <path> flag - 3 tests 223 tests passing across all crates. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>