code: void updateListenersWithFailure(Throwable t) {
          for (ConfigurationListener<T> listener : listeners) {
              try {
                  listener.updateFailed(t);
              } catch (Exception e) {
                  logger.error("Updating a listener with configuration request failure failed.", e);
              }
          }
      }
docs: Updates listeners with failure
  
  @param t reason