Error:
WARNING: Error fetching project information
org.sonarqube.ws.client.HttpException: Error 400 on https://sonar.system.tools/api/qualitygates/project_status?projectKey=
at org.sonarqube.ws.client.BaseResponse.failIfNotSuccessful(BaseResponse.java:34)
at hudson.plugins.sonar.client.HttpClient.getHttp(HttpClient.java:36)
at hudson.plugins.sonar.client.WsClient.getQualityGate54(WsClient.java:100)
at hudson.plugins.sonar.client.SQProjectResolver.getQualityGate(SQProjectResolver.java:104)
at hudson.plugins.sonar.client.SQProjectResolver.resolve(SQProjectResolver.java:66)
Solution:
Upgrade SonarQube Scanner Jenkins plugin. Versions 2.8+ will be able to fix the error above.