Where does Kinesis Agent store its state?

[dsidentity]

I'm investigating how to run Kinesis Agent in a Docker container. It will be mapped to a host folder where the application logs are written so it can read the logs. However I am not able to find in the documentation where the agent stores its state, to keep track of where in the log files it has read. I need to know this to ensure that if the container running the agent is restarted, the state is preserved. E.g. if the state is stored in a folder, I would mount it on the host drive or EFS.

I see in the source code, a FileCheckpointStore interface, but could not find any implementations of it:
https://github.com/awslabs/amazon-kinesis-agent/blob/master/src/com/amazon/kinesis/streaming/agent/tailing/checkpoints/FileCheckpointStore.java

Can someone answer this or point me to the right place (code or docs) to confirm?