TamsFlowCommonOutputSettings.retry property

How hard to try when pushing a segment fails, and how much backlog to tolerate while trying. Omit for engine defaults; individual fields may be omitted too.

Note that only transient failures (5xx, timeouts, connection errors) are retried. A rejection the request itself caused (4xx) is not, and an authentication failure (401/403) additionally pauses pushing until fresh credentials are supplied — both are reported via onNotification.

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