Prometheus uses GitHub to manage reviews of pull requests.
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If you have a trivial fix or improvement, go ahead and create a pull request.
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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.
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Relevant coding style guidelines are the Go Code Review Comments and the Formatting and style section of Peter Bourgon's Go: Best Practices for Production Environments.