ReadonlyattributesRecord attributes (currently unused, reserved for future use).
ReadonlyheadersRecord headers.
ReadonlykeyMessage key, or null if no key.
ReadonlyoffsetOffset delta from the batch's base offset.
ReadonlytimestampMillisecond delta from the batch's base timestamp.
ReadonlyvalueMessage value, or null for tombstones.
A single record within a RecordBatch. Represents the logical message with deltas computed relative to the batch.