Retry delay in seconds. A finite handler-supplied delay wins (rounded up, clamped to [0, BackoffMaxSeconds]); otherwise full jitter: random(0, min(BackoffMax, BackoffBase × 2^(attempt−1))).
Optional
Retry delay in seconds. A finite handler-supplied delay wins (rounded up, clamped to [0, BackoffMaxSeconds]); otherwise full jitter: random(0, min(BackoffMax, BackoffBase × 2^(attempt−1))).