@Override
    public String toString() {
        return "WalWriteRequest{" +
            "record=" + record +
            ", offset=" + offset +
            ", persisted=" + persisted +
            ", confirmed=" + confirmed +
            '}';
    }
Whether the record has been put to the {@link LogCache}
When a continuous series of records have been persisted to the WAL and uploaded to S3, they can be trimmed.

@see S3Storage.WALConfirmOffsetCalculator
s3stream/src/main/java/com/automq/stream/s3/WalWriteRequest.java