I installed Bamboo 5.5 and tried out Bamboo's Gatekeeper.
But currently it doesn't merge branches. Maybe I missed some settings somewhere.
I made a screenshot about the things I did.
Here are my settings: http://i.imgur.com/nyMR8NT.png
Currently my default Branch is develop, and we have some feature branches under feature/XXX
we using stash but our repository gets pulled with git from the operating system.
Edit:
I missed something, i wanted this option:
Bamboo will automatically create plan branches when it detects new branches in your version control system And automatically remove plan branches from Bamboo after a specified period of inactivity. Detection of new branches runs every 3 minutes.