const REDUCER_INPUT_CAPACITY: usize = 1024;Expand description
Input channel depth. Sized for ~512 in-flight events plus headroom for
burst: a 256-host fleet, ~2 events/host during peak rollout activation,
rounded to power-of-two and doubled. Backpressure surfaces at HTTP
handlers via try_send → 503 (caller retries), preserving the pull-only
agent contract (RFC-0005 §2.1 — CP never pushes, agents always retry).