@Override
    public String toString() {
        return "LogDeltaManifest(" +
                "provenance=" + provenance +
                ", leaderAndEpoch=" + leaderAndEpoch +
                ", numBatches=" + numBatches +
                ", elapsedNs=" + elapsedNs +
                ", numBytes=" + numBytes +
                ")";
    }
The total size of the records in bytes that we read while creating the delta.
metadata/src/main/java/org/apache/kafka/image/loader/LogDeltaManifest.java