chore(nat-gateway): Add nat_gateway_tags_per_az variable for NAT gateways

Author: pavlospt

examples/simple/main.tf

@@ -32,4 +32,10 @@ module "vpc" {
   private_subnets = [for k, v in local.azs : cidrsubnet(local.vpc_cidr, 4, k)]
 
   tags = local.tags
+
+  nat_gateway_tags_per_az = {
+    for az in local.azs : az => {
+      Name = "NAT Gateway - ${az}"
+    }
+  }
 }

main.tf

@@ -1096,6 +1096,7 @@ resource "aws_nat_gateway" "this" {
     },
     var.tags,
     var.nat_gateway_tags,
+    lookup(var.nat_gateway_tags_per_az, element(var.azs, count.index), {})
   )
 
   depends_on = [aws_internet_gateway.this]

variables.tf

@@ -1240,6 +1240,12 @@ variable "nat_gateway_tags" {
   default     = {}
 }
 
+variable "nat_gateway_tags_per_az" {
+  description = "Additional tags for the NAT gateways where the primary key is the AZ"
+  type        = map(map(string))
+  default     = {}
+}
+
 variable "nat_eip_tags" {
   description = "Additional tags for the NAT EIP"
   type        = map(string)