Remember that for the utility to have access to your other Docker services, you need to mount the socket inside the container.
You can adjust the arguments using the RIEMANN_DOCKER_HEALTH_ARGUMENTS
environment variable.
For example:
docker run -it -v /var/run/docker.sock:/var/run/docker.sock -e "RIEMANN_DOCKER_HEALTH_ARGUMENTS=-h your-riemann-server.com -t some -t tags --host-hostname your_hostname" your-tag