When creating a new issue there can be mandatory attributes that need selecting before the issue can be published. This ensures your project will display the granular metrics you desire and require. If fields are left blank users can publish issues with those fields empty.
Click the pencil at the end of 'Issue mandatory attributes' and select the multiple attributes you want defined. Then click the check mark to save those changes.
When creating a new issue, an asterisk will be shown beside the mandatory attribute fields.