code: @Override
      public DescribeMetricFiltersResult describeMetricFilters(DescribeMetricFiltersRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeMetricFilters(request);
      }
docs: <p>
  Lists the specified metric filters. You can list all the metric filters or filter the results by log name,
  prefix, metric name, or metric namespace. The results are ASCII-sorted by filter name.
  </p>
  
  @param describeMetricFiltersRequest
  @return Result of the DescribeMetricFilters operation returned by the service.
  @throws InvalidParameterException
  A parameter is specified incorrectly.
  @throws ResourceNotFoundException
  The specified resource does not exist.
  @throws ServiceUnavailableException
  The service cannot complete the request.
  @sample AWSLogs.DescribeMetricFilters
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/logs-2014-03-28/DescribeMetricFilters" target="_top">AWS API
  Documentation</a>