Using the rating feature, you can rate a requirement on a scale from 1 to 5. To use this feature on the document view, click above the tree and select Add Rating.

After the document view is reloaded, you can see rating icons to the left of the issues. These show the average rating of the issues.

To add a new rating to an issue, click and select the corresponding star. You can enter a comment, and then click Rate. The rating is updated to reflect the new average.

If you are a project administrator, you can delete the ratings for all issues on trackers. This function is available under the menu of the trackers.