feat(instance_template): supporting template and generated instance description

modules/instance_template/README.md

@@ -20,6 +20,7 @@ See the [simple](../../examples/instance_template/simple) for a usage example.
 | auto\_delete | Whether or not the boot disk should be auto-deleted | `string` | `"true"` | no |
 | automatic\_restart | (Optional) Specifies whether the instance should be automatically restarted if it is terminated by Compute Engine (not terminated by a user). | `bool` | `true` | no |
 | can\_ip\_forward | Enable IP forwarding, for NAT instances for example | `string` | `"false"` | no |
+| description | The template's description | `string` | `""` | no |
 | disk\_encryption\_key | The id of the encryption key that is stored in Google Cloud KMS to use to encrypt all the disks on this instance | `string` | `null` | no |
 | disk\_labels | Labels to be assigned to boot disk, provided as a map | `map(string)` | `{}` | no |
 | disk\_resource\_policies | A list (short name or id) of resource policies to attach to this disk for automatic snapshot creations | `list(string)` | `[]` | no |
@@ -29,6 +30,7 @@ See the [simple](../../examples/instance_template/simple) for a usage example.
 | enable\_nested\_virtualization | Defines whether the instance should have nested virtualization enabled. | `bool` | `false` | no |
 | enable\_shielded\_vm | Whether to enable the Shielded VM configuration on the instance. Note that the instance image must support Shielded VMs. See https://cloud.google.com/compute/docs/images | `bool` | `false` | no |
 | gpu | GPU information. Type and count of GPU to attach to the instance template. See https://cloud.google.com/compute/docs/gpus more details | <pre>object({<br>    type  = string<br>    count = number<br>  })</pre> | `null` | no |
+| instance\_description | Description of the generated instances | `string` | `""` | no |
 | ipv6\_access\_config | IPv6 access configurations. Currently a max of 1 IPv6 access configuration is supported. If not specified, the instance will have no external IPv6 Internet access. | <pre>list(object({<br>    network_tier = string<br>  }))</pre> | `[]` | no |
 | labels | Labels, provided as a map | `map(string)` | `{}` | no |
 | machine\_type | Machine type to create, e.g. n1-standard-1 | `string` | `"n1-standard-1"` | no |

modules/instance_template/main.tf

@@ -66,6 +66,8 @@ locals {
 resource "google_compute_instance_template" "tpl" {
   provider                = google-beta
   name_prefix             = "${var.name_prefix}-"
+  description             = var.description
+  instance_description    = var.instance_description
   project                 = var.project_id
   machine_type            = var.machine_type
   labels                  = var.labels

modules/instance_template/metadata.yaml

@@ -146,6 +146,10 @@ spec:
         description: Enable IP forwarding, for NAT instances for example
         varType: string
         defaultValue: "false"
+      - name: description
+        description: The template's description
+        varType: string
+        defaultValue: ""
       - name: disk_encryption_key
         description: The id of the encryption key that is stored in Google Cloud KMS to use to encrypt all the disks on this instance
         varType: string
@@ -184,6 +188,10 @@ spec:
               type  = string
               count = number
             })
+      - name: instance_description
+        description: Description of the generated instances
+        varType: string
+        defaultValue: ""
       - name: ipv6_access_config
         description: IPv6 access configurations. Currently a max of 1 IPv6 access configuration is supported. If not specified, the instance will have no external IPv6 Internet access.
         varType: |-

modules/instance_template/variables.tf

@@ -26,6 +26,18 @@ variable "name_prefix" {
   default     = "default-instance-template"
 }
 
+variable "description" {
+  description = "The template's description"
+  type        = string
+  default     = ""
+}
+
+variable "instance_description" {
+  description = "Description of the generated instances"
+  type        = string
+  default     = ""
+}
+
 variable "machine_type" {
   description = "Machine type to create, e.g. n1-standard-1"
   type        = string