Steps to reproduce

1. Find code that conditionally logs at one of two different levels, based on Logger#isLoggable: For example:

if (LOGGER.isLoggable(Level.FINEST)){
  LOGGER.finest(…);
} else {
  LOGGER.fine(…);
}

2. Create a log recorder at http://localhost:8080/jenkins/manage/log/ that logs messages for the logger above at FINEST and Save.

3. Edit the previously created log recorder to log at FINE only.

4. Do whatever is needed to log something from step 1.

Expected result

See the FINE message

Actual result

See no message, since the logger is still set to FINEST, just not for this log recorder (the global levels view at http://localhost:8080/jenkins/manage/log/levels shows this).

Since http://localhost:8080/jenkins/manage/log/all ignores everything more verbose than INFO, these FINEST messages cannot be seen anywhere.

Workaround

On http://localhost:8080/jenkins/manage/log/levels also reduce the log level for the logger.