nri-kafka: expose retry counts (for worker managing its own offsets) #129
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We're exposing how many times a message has been retried to consumer subscription handlers.
This allows consumers to implement a dead letter queue.
We're exposing that only for consumers that manage their own offsets, because that's where we're building a DLQ rn. If more people want DLQs, we can do it for regular
subscribe
too.