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Hello.
Automatic scale-in and scale-out cycles when ALB target health checks fail.
So, we must first configure the ALB health check to succeed.
Points to check for basic troubleshooting are listed in the following documents.
https://repost.aws/knowledge-center/elb-fix-failing-health-checks-alb
The following document describes how to check for EC2 problems in an AutoScaling group.
Start EC2 from the startup template and check that the web server is running properly in the OS and that the application responds normally.
Also make sure that the security group is set to allow access from the ALB.
https://docs.aws.amazon.com/autoscaling/ec2/userguide/ts-as-healthchecks.html