On controllers with large numbers of builds, the 'Periodic background build discarder.log' files generated by https://github.com/jenkinsci/jenkins/blob/master/core/src/main/java/jenkins/model/BackgroundGlobalBuildDiscarder.java can grow to hundreds of MB in size. That coupled with the fact that we keep six of these can lead to over a GB of logs being included in support bundles. I'm not sure how much value there is in this log data; maybe it should be quieter or off by default, and only enabled for debugging purposes?