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Retries turn transient failures into success stories—when configured carefully. Backoff spreads load; max attempts bound damage; dead-letter queues preserve poison messages for inspection instead of infinite loops.

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Backoff

Exponential backoff reduces thundering herds. Add jitter to desynchronize clients so retries do not align on the same second.

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Caps

Put an upper bound on delay so a permanently broken endpoint does not stall workers for hours between attempts—pair backoff with a max attempts ceiling.

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Max attempts

Stop after N tries and surface to operators with context. Include the last error code, truncated body, and correlation ID so the first responder does not reproduce the whole incident from scratch.

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Idempotency

Retries assume idempotent handlers. If a step is not idempotent, disable blind retries or scope them to safe sub-operations.

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Dead letters

Send poison messages to a dead-letter queue for manual inspection. Monitor DLQ depth: a flat line at zero might mean alerts are misconfigured; a rising line means systemic failure.

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Replay

Document a safe replay procedure after fixing root cause—sometimes replay requires a new idempotency key or compensating cleanup first.