Each subsystem role should follow the file and directory layout as described in the
Playbooks Best Practices guide, as well as including an example-playbook.yml file in the top level directory that demonstrates its usage.
New roles should have an API described in the Varlink format and placed in the api/ directory.
All changes should be tested via the tests found in the test/ directory.
A pull request should contain appropriate changes to the tests to ensure that the
change works as expected.