In the configuration section you have a list of default rules.
You can update those rules or create new one.
The name and description are important because this information will be showed to the user.
- Assignee and reporter are related only with an issue.
- Project Lead: only available in issues and projects.
- Accumulated for different issue types
- A new version is released by project leader and it doesn't have open issues
- Assignee user close the issue in the due date
There is more information about the list of rules in the user section.