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- tracing: responseWriter now forwards Flush and exposes Unwrap. Without it w.(http.Flusher) failed for every request passing the tracing middleware, so the parked-stream keep-alive never started: a parked streaming request wrote nothing for up to ADMISSION_MAX_PARK_SECONDS, which is exactly the client timeout the keep-alive was added to prevent. - proxy: once the SSE status line is spent, ModifyResponse frames an upstream response >= 400 as an event: error instead of letting a raw error body land inside the stream, where a streaming client reads it as an empty completion and reports success. net/http keeps the first status, so the upstream status cannot be forwarded after the park has written one. - engine_state: new Snapshot() returns the state and its tick channel under one lock. Get and Tick taken separately can miss the poll that lands between the two calls, parking a request for an extra interval. - engine_state: observer_degraded now tracks current parsability rather than being raised once on the first poll and never cleared, which pinned it at 1 after a single truncated response and never reported drift that appeared later. markDegraded only touches the exporter when the value changes. - deployment: ADMISSION_MAX_INFLIGHT is set explicitly to 4, documenting the coupling to the engine's --max-num-seqs, instead of silently defaulting to VLLM_MAX_NUM_SEQS.