As a developer, what I do is this:
1. Clone the repo
2. Run the plugin with: mvnDebug -q hpi:run -Djava.util.logging.config.file=logging.properties -Djenkins.version=2.89.3
3. Attach a debugger, I use Eclipse
I also have a logging.properties file containing:
| handlers = java.util.logging.ConsoleHandler |
| org.jenkinsci.plugins.jvcts.level = FINE |
| java.util.logging.ConsoleHandler.level = FINE
|
If you are not a developer, I would suggest filing a detailed issue on the plugin. Perhaps it needs better logging, or some sort of feedback.