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The structural admission gate (src/shared/middleware/chatBodyAdmission.ts — the bounded heavyweight lease + healthy-headroom path from #10110/#10437) returns its 503 chat_admission_busy BEFORE request logging, so a shed left no trace: no counter, no log line, and the process-wide snapshot was never consumed by any route. This adds pure observability — admission behavior, defaults, and thresholds are untouched. - chatBodyAdmission.ts: in-memory shed history (shedTotal + shedsByReason) on ChatAdmissionController, recorded at the two capacity-driven give-up points in acquireHeavyWithin (queue_timeout when the bounded wait expires, queued_bytes_budget when the heap valve refuses to park). A client abort mid-wait is deliberately not counted — capacity was never denied. Each shed also emits exactly one structured pino warn (module chat-admission) with reason/activeHeavy/waiting/queuedBytes and the HMAC session fingerprint — never a raw credential. PerConnectionAdmission Controller.snapshot() now carries the counters plus activeHealthyHeadroom. - /api/monitoring/health: the structural snapshot is exposed under a new additive chatAdmission key next to the existing adaptiveAdmission (the shadow-mode layer) — allowlisted projection in observability.ts, nothing removed from the current payload. - Tests: tests/unit/chat-admission-visibility-11244.test.ts (RED→GREEN: shed counting per reason, abort exclusion, snapshot shape, and the warn log carrying the fingerprint but never the raw API key) + a chatAdmission allowlist-projection test in observability-payloads.test.ts.