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.
If you have multiple entries, a log entry that matches any of them
will be collected.
Also see
this document for more about logging in Java and Hudson.