tf: support advanced health check parameters

deploy/tf/alb.tf

@@ -6,8 +6,11 @@ resource "aws_lb_target_group" "app" {
   vpc_id      = local.vpc_id
 
   health_check {
-    enabled = true
-    path    = var.health_check_path
+    enabled             = true
+    path                = var.health_check_path
+    healthy_threshold   = var.healthy_threshold != null ? var.healthy_threshold : null
+    interval            = var.interval != null ? var.interval : null
+    unhealthy_threshold = var.unhealthy_threshold != null ? var.unhealthy_threshold : null
   }
 }
 

deploy/tf/variables.tf

@@ -69,12 +69,6 @@ variable "environment" {
   type        = string
 }
 
-variable "health_check_path" {
-  description = "The health check path for the ALB target group."
-  type        = string
-  default     = "/health"
-}
-
 variable "iam_statements" {
   description = "List of IAM statements to attach to the task role"
   type        = any
@@ -104,3 +98,28 @@ variable "proxy_port" {
   type        = number
   default     = 80
 }
+
+# Target group health checks
+variable "health_check_path" {
+  description = "The health check path for the ALB target group."
+  type        = string
+  default     = "/health"
+}
+
+variable "healthy_threshold" {
+  description = "Number of consecutive health check successes required before considering a target healthy. The range is 2-10."
+  type        = number
+  default     = null
+}
+
+variable "interval" {
+  description = "The amount of time in seconds between health checks."
+  type        = number
+  default     = null
+}
+
+variable "unhealthy_threshold" {
+  description = "Number of consecutive health check failures required before considering a target unhealthy. The range is 2-10."
+  type        = number
+  default     = null
+}