public void fine(String message) {
    if (fineEnabled()) {
      logger.fine(message);
    }
  }
Make logger null when the singleton (which was referred by INSTANCE) gets garbage collected.
Makes an attempt at removing associated {@link Handler}s of the {@link Logger}.
geode-gfsh/src/main/java/org/apache/geode/management/internal/cli/LogWrapper.java