title: Sonarqube Alert - New Major Issues since change previous analysis
body: <p>I'm trying to create a notification in sonarqube (4.1.2) that will notify me whenever any new analysis found any new major issues. So I created an alert which is:</p>
  
  <p>new major issues + change since previous analysis + is greater than 0 warning threshold and 0 error threshold</p>
  
  <p>However I'm sometimes am not notify when there's a new major issue on the new analysis. I was wondering about how does this "new major issue" alert works?</p>
  
  <p>Example:
  I get major issue A and B in previous analysis. I rerun the analysis this time around after fixing A and B but I introduce major issue C. Will the new major issue be 1 (new major issue C) or -1 (C minus A and B)</p>