Where to find existing "track" in release repository?

edit

Tracks are stored on the bloom branch in the tracks.yaml file:

https://github.com/ros-gbp/qt_gui_cor...

It was released into groovy with an older version of bloom, you can create a new groovy track before releasing if you want:

bloom-release --rosdistro groovy --track groovy qt_gui_core --edit

EDIT Now the tracks.yaml files are stored on the master branch, hopefully that is more discoverable. Note that they will only be on the master branch once release with a newer version of bloom so some repositories may still have their track files stored in the bloom branch. I also updated the command to reflect the new syntax.