code: public boolean isMaintenanceModeEnabled(String appName) {
          App app = connection.execute(new AppInfo(appName), apiKey);
          return app.isMaintenance();
      }
docs: Checks if maintenance mode is enabled for the given app
  
  @param appName See {@link #listApps} for a list of apps that can be used.
  @return true if maintenance mode is enabled