code: @Override
      public DescribeStackSummaryResult describeStackSummary(DescribeStackSummaryRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeStackSummary(request);
      }
docs: <p>
  Describes the number of layers and apps in a specified stack, and the number of instances in each state, such as
  <code>running_setup</code> or <code>online</code>.
  </p>
  <p>
  <b>Required Permissions</b>: To use this action, an IAM user must have a Show, Deploy, or Manage permissions
  level for the stack, or an attached policy that explicitly grants permissions. For more information about user
  permissions, see <a
  href="http://docs.aws.amazon.com/opsworks/latest/userguide/opsworks-security-users.html">Managing User
  Permissions</a>.
  </p>
  
  @param describeStackSummaryRequest
  @return Result of the DescribeStackSummary operation returned by the service.
  @throws ValidationException
  Indicates that a request was not valid.
  @throws ResourceNotFoundException
  Indicates that a resource was not found.
  @sample AWSOpsWorks.DescribeStackSummary
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/opsworks-2013-02-18/DescribeStackSummary" target="_top">AWS
  API Documentation</a>