The plugins log gatherer only captures 16K logs and is. hard coded

on a busy Jenkins system (or ones with issues which is why you want to use the support data to begin with!) the logs get rotated in a matter of minutes.

This lack of logging can make diagnosing issues problematic as generally a bundle would be created some time after an event has happened and as such can be missing the important logs.

Much more data should be retained, potentially this should be configurable (either via the UI or the system property).