To simply run using default the configuration, use:

pytest --stats-d tests/

If there is a need to configure where to sent results to other than localhost:8125, use:

pytest --stats-d --stats-host http://myserver.com --stats-port 3000 tests/

You can also prefix your results if you plan on having multiple projects sending results to the same server:

pytest --stats-d --stats-prefix myproject test/