This plugin is used to compute a real violation density metric. 0% is good. 100% or more is bad.
'org.codehaus.sonar-plugins:sonar-violationdensity-plugin:1.1'
<dependency>
<groupId>org.codehaus.sonar-plugins</groupId>
<artifactId>sonar-violationdensity-plugin</artifactId>
<version>1.1</version>
</dependency>
<dependency org="org.codehaus.sonar-plugins" name="sonar-violationdensity-plugin" rev="1.1"/>
"org.codehaus.sonar-plugins", "sonar-violationdensity-plugin", "1.1"