Decide for one Bugtracker
I recently ended up adding some stuff to the issue-queues of the respective GitHub repositories (https://github.com/LaosLaser/Firmware/issues).
I did not remember, you are also using redmine, so this could be a problem since issues/bugs could be forgotten or duplicated.
I personally like the GitHub version more, because it's well integrated with the code (e.g. references from commit messages) and supports pull-requests. But I also understand the advantages of self-hosted solutions.
So what is you preference? Should bugs/issues/pull-requests be discussed here or on GitHub? Maybe we should make this information obvious by either disableing the GitHub issues or make an info-box on the redmine page?