code: @Override
      public ListV2LoggingLevelsResult listV2LoggingLevels(ListV2LoggingLevelsRequest request) {
          request = beforeClientExecution(request);
          return executeListV2LoggingLevels(request);
      }
docs: <p>
  Lists logging levels.
  </p>
  
  @param listV2LoggingLevelsRequest
  @return Result of the ListV2LoggingLevels operation returned by the service.
  @throws InternalException
  An unexpected error has occurred.
  @throws NotConfiguredException
  The resource is not configured.
  @throws InvalidRequestException
  The request is not valid.
  @throws ServiceUnavailableException
  The service is temporarily unavailable.
  @sample AWSIot.ListV2LoggingLevels