fix!: Remove unnecessary breaking changes when upgrading to v11.0.0+

modules/instance_template/README.md

@@ -59,7 +59,7 @@ See the [simple](../../examples/instance_template/simple) for a usage example.
 | subnetwork\_project | The ID of the project in which the subnetwork belongs. If it is not provided, the provider project is used. | `string` | `""` | no |
 | tags | Network tags, provided as a list | `list(string)` | `[]` | no |
 | threads\_per\_core | The number of threads per physical core. To disable simultaneous multithreading (SMT) set this to 1. | `number` | `null` | no |
-| total\_egress\_bandwidth\_tier | Egress bandwidth tier setting for supported VM families | `string` | `"DEFAULT"` | no |
+| total\_egress\_bandwidth\_tier | Egress bandwidth tier setting for supported VM families. Valid values are 'DEFAULT' or 'TIER_1' | `string` | `null` | no |
 
 ## Outputs
 

modules/instance_template/main.tf

@@ -43,6 +43,8 @@ locals {
   # initialize the block only if it is enabled.
   shielded_vm_configs = var.enable_shielded_vm ? [true] : []
 
+  create_network_performance_config = var.total_egress_bandwidth_tier != null
+
   gpu_enabled            = var.gpu != null
   alias_ip_range_enabled = var.alias_ip_range != null
   on_host_maintenance = (
@@ -206,8 +208,11 @@ resource "google_compute_instance_template" "tpl" {
     enable_confidential_compute = var.enable_confidential_vm
   }
 
-  network_performance_config {
-    total_egress_bandwidth_tier = var.total_egress_bandwidth_tier
+  dynamic "network_performance_config" {
+    for_each = local.create_network_performance_config ? [var.total_egress_bandwidth_tier] : []
+    content {
+      total_egress_bandwidth_tier = network_performance_config.value
+    }
   }
 
   dynamic "guest_accelerator" {

modules/instance_template/variables.tf

@@ -295,11 +295,11 @@ variable "additional_networks" {
 }
 
 variable "total_egress_bandwidth_tier" {
-  description = "Egress bandwidth tier setting for supported VM families"
+  description = "Egress bandwidth tier setting for supported VM families. Valid values are 'DEFAULT' or 'TIER_1'."
   type        = string
-  default     = "DEFAULT"
+  default     = null
   validation {
-    condition     = contains(["DEFAULT", "TIER_1"], var.total_egress_bandwidth_tier)
+    condition     = var.total_egress_bandwidth_tier != null ? contains(["DEFAULT", "TIER_1"], var.total_egress_bandwidth_tier) : true
     error_message = "Allowed values for bandwidth_tier are 'DEFAULT' or 'TIER_1'."
   }
 }