Specify a set of logger names and the corresponding log levels that this log recorder will collect. For example, if you specify hudson.model.Hudson and info, any logs recorded for hudson.model.Hudson or its descendants with the log level info or above will show up in this log recorder, unless a more specific logger with higher log level is also specific.

If you have multiple entries, a log entry will the most specific one will be collected.

Also see this document for more about logging in Java and Jenkins.