The main repository is on GitHub https://github.com/ubisoft/mixer, please post your issues and merge requests there.
On the Gitlab repository you can see the CI tasks running (linting, unit tests, packing the addon and releases) and you have access to clean releases on the dedicated page https://github.com/ubisoft/mixer/releases.
You can report any bug through issues on GitHub. Please include the version you use in the issue and how to reproduce the bug, if possible. You can join a blender file, or a room file that you can save with the "Download Room" button in advanced room options.
In the code you might see references to VRtist or Shot Manager, which are other technologies / addons that are developed in our studio. Don't pay too much attention to related code since we plan to extract it in some way, probably with a plugins strategy.
You can submit a pull requests on GitHub, but keep in mind that the architecture of the addon is likely to change significantly in the next few months. For bugfixes, simple refactoring, typos, documentation, or things related to the usage of the Blender API you can directly submit the merge request. For features please also open an issue to discuss it, so we can think about how it would fit in the future architecture.
If you have quick questions or want to chat with us, we have a channel on the Blender chat dedicated to this addon: https://blender.chat/channel/mixer-addon
More documentation is available in the doc directory: