War Story: Saving $200k/Year on AWS by Migrating 50% of Workloads to Graviton4 with Terraform 1.10

The Terraform configuration you provided sets up an autoscaling group (ASG) with a mix of Graviton4 and x86-based EC2 instances. Here's a breakdown of the key components:

Variables

1. ssh_key_name: The name of the SSH key pair to use for instances.
2. container_image: The container image URL for the payment processor application.
3. image_tag: The tag of the container image to deploy (default is graviton4-v1.0.0).
4. asg_desired_capacity: Desired number of instances in ASG (default is 20, with a 50% split between Graviton4 and x86 instances).
5. asg_max_size: Maximum number of instances allowed in the ASG.
6. subnet_ids: List of subnet IDs where the EC2 instances will be launched.

Resources

1. Security Group (aws_security_group.payment_processor_sg): Allows inbound traffic on port 80 (HTTP) and SSH access from a specified CIDR block.

2. **Launch Template (`aws_launch_template.payment_processor

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