https://aws.amazon.com/about-aws/whats-new/2017/07/application-load-balancer-adds-support-for-new-requestcountpertarget-cloudwatch-metric/
Application Load Balancer Adds Support for New RequestCountPerTarget CloudWatch Metric - AWS
Discover more about what's new at AWS with Application Load Balancer Adds Support for New RequestCountPerTarget CloudWatch Metric
application load balancersupport foradds