If you would like to contribute to the development of OpenStack, you must follow the steps in this page:: http://docs.openstack.org/infra/manual/developers.html Once those steps have been completed, changes to OpenStack should be submitted for review via the Gerrit tool, following the workflow documented at:: http://docs.openstack.org/infra/manual/developers.html#development-workflow You can get the mistral documentation at:: docs.openstack.org/developer/mistral Pull requests submitted through GitHub will be ignored. Bugs should be filed on Launchpad, not GitHub:: https://bugs.launchpad.net/mistral