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* fix(cloud): recalibrate the relay monitor's exhausted-retry freeze to a measured bar The pre-drain dry-run froze at minute one on relayPostgresRetryExhausted: 0 in every run since #18521 reached the director, blocking the cell roll that carries the same fix. #18521 made contended request-path waiters fail fast (500 ms) instead of succeeding slowly, so exhaustion is now a steady contention rate: 236/236 five-minute windows non-zero over 23 h; post-#18521 p50 42 / p90 147 / max 220 fleet-wide; the 2026-08-23 incident peaked at 467. 300 clears every measured healthy window and stays under the incident shape. /v1/assign 503 share was unchanged by #18521 (13.9% vs 12.3%). * test(cloud): pin the exhausted-retry freeze boundary at exactly 300 * docs(cloud): reword relay comments that still described the zero exhausted-retry bar