The behaviours control what is discovered from the Tuleap server. The behaviours are grouped into a number of categories:
Repository
These behaviours determine what repositories get discovered. Only repositories that have at least one discovered branch / pull request can themselves be discovered.
Within repository
These behaviours determine what gets discovered within each repository. If you do not configure at least one discovery behaviour then nothing will be found!
General
These behaviours affect the configuration of each discovered branch.