COST 8. Do you decommission resources that you no longer need or stop resources that are temporarily not needed?
Ensure that you only pay for services that are being used. Implement change control and resource management from project inception to end-of-life so that you can identify necessary process changes or enhancements where appropriate. Work with AWS Support for recommendations on how to optimize your project for your workload: for example, when to use Auto Scaling, AWS OpsWorks, AWS Data Pipeline, or the different Amazon EC2-provisioning approaches.
Best practices:
 Design your system to gracefully handle instance termination as you identify and decommission non-critical or unrequired instances or resources with low utilization.
 Have a process in place to identify and decommission orphaned resources.
 Reconcile decommissioned resources based on either system or process.