Amazon EC2 Auto Scaling now allows you to view deleted Auto Scaling groups in the scaling history. Previously if you deleted an Auto Scaling group, you need to either maintain the record of scaling activities for deleted Auto Scaling groups or ask support team to get the record for the same. Now, you can specify one additional parameter in a describe call to get a description of the scaling history for deleted Auto Scaling groups. This makes it easier to keep a record of scaling activities after an application has been shut down.
Source:: Amazon AWS