Allow configuration of autoscaling metric

main.tf

@@ -105,5 +105,7 @@ module "ecs" {
   sg_egress_with_cidr_blocks = var.ecs_sg_egress_with_cidr_blocks
   vpc_id                     = local.vpc_id
 
+  container_scale_up_when_cpu_pct_above = var.autoscaling_cpu_threshold_pct
+
   depends_on = [module.lb]
 }

modules/ecs/main.tf

@@ -162,22 +162,6 @@ resource "aws_appautoscaling_target" "superblocks" {
   service_namespace  = "ecs"
 }
 
-resource "aws_appautoscaling_policy" "memory" {
-  name               = "${var.name_prefix}-scaling-policy-memory"
-  policy_type        = "TargetTrackingScaling"
-  resource_id        = aws_appautoscaling_target.superblocks.resource_id
-  scalable_dimension = aws_appautoscaling_target.superblocks.scalable_dimension
-  service_namespace  = aws_appautoscaling_target.superblocks.service_namespace
-
-  target_tracking_scaling_policy_configuration {
-    predefined_metric_specification {
-      predefined_metric_type = "ECSServiceAverageMemoryUtilization"
-    }
-
-    target_value = var.container_scale_up_when_memory_pct_above
-  }
-}
-
 resource "aws_appautoscaling_policy" "cpu" {
   name               = "${var.name_prefix}-scaling-policy-cpu"
   policy_type        = "TargetTrackingScaling"

variables.tf

@@ -369,3 +369,9 @@ variable "additional_ecs_execution_task_policy_arns" {
   default     = []
   description = "List of ARNs of Additional iam policy to attach to the ECS execution role"
 }
+
+variable "autoscaling_cpu_threshold_pct" {
+  type        = number
+  default     = 90
+  description = "The CPU threshold percentage at which the autoscaling policy will scale up the number of tasks."
+}