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Hi
The reason the "ALBRequestCountPerTarget" option was greyed out was due to not having an application load balancer configured for the ECS cluster service.
When configuring the service for the ECS cluster, you will need to specify the Application Load Balancer that will be used to distribute incoming traffic across the tasks running in your service [1].
Once the Load balancer has be configured, you will be able to Configure Service Auto Scaling to adjust your service’s desired count [2], then be able to select the “ALBRequestCountPerTarget” as the ‘ECS service metric’ on the target tracking scaling policy [2]. [1] https://docs.aws.amazon.com/AmazonECS/latest/developerguide/service-create-loadbalancer-rolling.html
[2] https://docs.aws.amazon.com/AmazonECS/latest/developerguide/service-configure-auto-scaling.html
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