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docs: ext_proc breaker also caps synchronized fast-path bursts - #2498
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A burst of requests to running actors above the headroom fails closed in Envoy's ext_proc filter, which the router never sees. Say so and how to size the flag. Signed-off-by: Davanum Srinivas <davanum@gmail.com>
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Requests to running actors share the ext_proc circuit breaker with the parking lot; a synchronized burst above the headroom fails closed in Envoy's ext_proc filter (
status_on_error, 500 by default) with no router signal.Doc only: the signal, the admin stats that count it, sizing
--extproc-max-requests. The router setsmax_requestsonly;max_connectionsandmax_pending_requestskeep Envoy's 1024 default.