- 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.
- Add internal/tracing package with OTel tracer initialization
- HTTP middleware for server-side tracing (request/response attributes)
- Transport wrapper for client-side upstream call tracing
- Update proxy to use tracing transport
- Add OTEL_* env vars to k8s deployment
Traces flow: api-gateway -> otel-collector -> tempo -> grafana
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