Optional ReadonlyheadersOptional message headers.
ReadonlykeyOptional message key for partitioning. null means no key.
Optional ReadonlytimestampTimestamp in milliseconds since epoch. Set by producer or broker.
ReadonlyvalueMessage value (payload). null represents a tombstone.
A Kafka message to be produced or that has been consumed.
Key and value use
Uint8Arrayper locked decision #2.