String getSeqNumber() {
    return seqNumber;
  }
Kinesis system consumer related checkpoint information that is stored in the IncomingMessageEnvelope offset.

It contains the following metadata:
<ul>
  <li> shardId: Kinesis stream shardId.
  <li> seqNumber: sequence number in the above shard.
</ul>

Please note that the source of truth for checkpointing is the AWS dynamoDB table corresponding to the application.
The offset that is stored in Samza checkpoint topic is not used.
samza-aws/src/main/java/org/apache/samza/system/kinesis/consumer/KinesisSystemConsumerOffset.java