code: public void removeLoggerEventListener(final LoggerEventListener listener) {
      synchronized (loggerEventListeners) {
        HierarchyEventListenerProxy proxy =
                (HierarchyEventListenerProxy) loggerEventListeners.get(listener);
        if (proxy == null) {
          LogLog.warn(
            "Ignoring attempt to remove a non-registered LoggerEventListener.");
        } else {
          loggerEventListeners.remove(listener);
          proxy.disable();
        }
      }
    }
docs: Remove a {@link LoggerEventListener} from the repository.
  @param listener listener to be removed