code: public void removeLoggerRepositoryEventListener(
      final LoggerRepositoryEventListener listener) {
      synchronized (repositoryEventListeners) {
        if (!repositoryEventListeners.contains(listener)) {
          LogLog.warn(
            "Ignoring attempt to remove a "
                    + "non-registered LoggerRepositoryEventListener.");
        } else {
          repositoryEventListeners.remove(listener);
        }
      }
    }
docs: Remove a {@link LoggerRepositoryEventListener} from the repository.
  @param listener listener