code: @Override
      public DescribeMetricCollectionTypesResult describeMetricCollectionTypes(DescribeMetricCollectionTypesRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeMetricCollectionTypes(request);
      }
docs: <p>
  Describes the available CloudWatch metrics for Amazon EC2 Auto Scaling.
  </p>
  <p>
  The <code>GroupStandbyInstances</code> metric is not returned by default. You must explicitly request this metric
  when calling <a>EnableMetricsCollection</a>.
  </p>
  
  @param describeMetricCollectionTypesRequest
  @return Result of the DescribeMetricCollectionTypes operation returned by the service.
  @throws ResourceContentionException
  You already have a pending update to an Amazon EC2 Auto Scaling resource (for example, an Auto Scaling
  group, instance, or load balancer).
  @sample AmazonAutoScaling.DescribeMetricCollectionTypes
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/autoscaling-2011-01-01/DescribeMetricCollectionTypes"
  target="_top">AWS API Documentation</a>