pub const RETRY_BACKOFF: [Duration; 3];Expand description
Backoff schedule for retrying a failed watch() call, per spec §4 point
1 — bounded at 3 attempts over ~4.2s total, not indefinite: a path that’s
still failing after this moves into degraded_paths and is picked up by
the periodic health sweep (pool.rs’s HEALTH_SWEEP_INTERVAL) instead of
spinning a dedicated retry loop forever.