Metrics collection agent for OpenTSDB:
http://opentsdb.net/docs/build/html/user_guide/utilities/tcollector.html
https://github.com/OpenTSDB/tcollector/
Running it will by default look for a host called opentsdb and begin sending metrics to it.
docker run -ti harisekhon/tcollector
For a full example of using this along with OpenTSDB see the Advanced Nagios Plugins Collection's tests/docker/opentsdb-docker-compose.yml
Related Docker images can be found for many Open Source, Big Data and NoSQL technologies on my DockerHub profile. The source for them all can be found in the master Dockerfiles GitHub repo.