The format of the Pull request title must be:
<component>: <short_change_message> #<issue number>
If you add a github-recognised keyword then the associated issue can be closed automatically once the pull request is merged, e.g.::
<component>: <short_change_message> Fix #<issue number>
Valid component names are listed in the label list <https://github.com/rucio/rucio/labels>_.