# Contributing Prometheus uses GitHub to manage reviews of pull requests. * If you have a trivial fix or improvement, go ahead and create a pull request, addressing (with `@...`) the maintainer of this repository (see [MAINTAINERS.md](MAINTAINERS.md)) in the description of the pull request. * If you plan to do something more involved, first discuss your ideas on [our mailing list]. This will avoid unnecessary work and surely give you and us a good deal of inspiration. * Before your contributions can be landed, they must be signed off under the [Developer Certificate of Origin] which asserts you own and have the right to submit the change under the open source licence used by the project. ## Testing Submitted changes should pass the current tests, and be covered by new test cases when adding functionality. * Run the tests locally using [tox] which executes the full suite on all supported Python versions installed. * Each pull request is gated using [Travis CI] with the results linked on the github page. This must pass before the change can land, note pushing a new change will trigger a retest. ## Style * Code style should follow [PEP 8] generally, and can be checked by running: ``tox -e flake8``. * Import statements can be automatically formatted using [isort]. [our mailing list]: https://groups.google.com/forum/?fromgroups#!forum/prometheus-developers [Developer Certificate of Origin]: https://github.com/prometheus/prometheus/wiki/DCO-signing [isort]: https://pypi.org/project/isort/ [PEP 8]: https://www.python.org/dev/peps/pep-0008/ [tox]: https://tox.readthedocs.io/en/latest/ [Travis CI]: https://docs.travis-ci.com/
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