code: public String getAutoScalingGroup() {
          DescribeAutoScalingInstancesRequest req = new DescribeAutoScalingInstancesRequest();
          req.setInstanceIds(Collections.singleton(this.getInstanceId()));
          DescribeAutoScalingInstancesResult result = this.autoScalingClient.describeAutoScalingInstances(req);
          if (result.getAutoScalingInstances().size() != 1) {
              throw new IllegalStateException("Found multiple auto scaling instances");
          }
          return result.getAutoScalingInstances().get(0).getAutoScalingGroupName();
      }
docs: <br>
  Needed AWS actions:
  <ul>
  <li>autoscaling:DescribeAutoScalingInstances</li>
  </ul>
  
  @return the name of the auto scaling group the current instance is a member of