Could you help me with this question? I have the same problem: http://stackoverflow.com/questions/38120187/failing-a-build-in-jenkins-using-the-quality-gate-plugin
Same issue with Jenkins 2.33 and Quality Gates Plugin 2.5
Sonar version 5.6.3
The Quality Gates of this sonar project failed some builds ago, but is now green again. The jenkins jobs is still failing.
Can't see any information in the log file.