The proxy stream circuit introduced in v0.1.164 (#4749) removes every
account behind a quarantined proxy from scheduling. When all schedulable
accounts share one proxy (a common deployment), two mid-stream
disconnects within a minute zeroed out capacity for 10 minutes and every
request failed with 502. One HTTP/2 connection loss also killed all
multiplexed streams at once, tripping the threshold from a single event.
- Quarantine now degrades to a preference: when the only reason no
account is available is proxy quarantine, selection retries once with
the quarantine bypassed, so capacity can never reach zero.
- Disconnects within 3s per proxy collapse into one failure event.
- Add gateway.openai_proxy_stream_circuit.disabled escape hatch.
- A completed stream still clears the quarantine immediately; TTL,
thresholds and recording guards are unchanged.
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