This plugin is deprecated since SonarQube 4.0. Please move to the concept of Technical Debt introduced in SonarQube 4.0.
Description / Features
The Quality Index plugin combines a global measure (quality index) of quality with a measure of the method complexity (complexity factor).
The Quality Index measures 4 weighted axes of quality and combines them to give a global note score between 0 and 10 to the project, 10 being the best.
Coverage = Code coverage by unit tests.
If there is are no unit tests and thus no code coverage, the Coverage axis will get the worst grade.
The Complexity Factor measures the complexity density.