...
Issue Server URL
The Issue Server URL is a a template URL for generating links to your issue system. A simple way to construct the URL is to take a link to a certain issue in your issue system then substitute the issue id field in it with {id}. When the issue id's are parsed out of the commit message using the commit message regex, they'll then be substituted into the template URL where the {id} field was placed.
Link an Issue Connector to a Repository
...