KIP-1317 — Mandatory DLQ Disposition Header for Share Groups

Discussion BrokerConsumer

Requires the share group coordinator to write standardized headers on every DLQ record — `_dlq.errors.disposition` plus original topic, partition, offset, consumer group and ISO-8601 timestamp — with disposition values such as MAX_DELIVERY_ATTEMPTS_REACHED, CLIENT_REJECTED and CIRCUIT_BREAKER_ARCHIVED. KIP-1191 does not persist the routing reason the broker already knows, so a poison pill is indistinguishable from an explicit NACK or a transient infrastructure failure, forcing operators to correlate DLQ offsets against broker logs and blocking automated replay tooling.

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