Adding stack_type info to the docs

modules/vmseries/README.md

@@ -57,7 +57,7 @@ No modules.
 | <a name="input_min_cpu_platform"></a> [min\_cpu\_platform](#input\_min\_cpu\_platform) | Minimum CPU platform for the compute instance. Up to date version can be found [here](https://cloud.google.com/compute/docs/instances/specify-min-cpu-platform). | `string` | `"Intel Cascade Lake"` | no |
 | <a name="input_name"></a> [name](#input\_name) | Name of the VM-Series instance. | `string` | n/a | yes |
 | <a name="input_named_ports"></a> [named\_ports](#input\_named\_ports) | The list of named ports to create in the instance group:<pre>named_ports = [<br>  {<br>    name = "http"<br>    port = "80"<br>  },<br>  {<br>    name = "app42"<br>    port = "4242"<br>  },<br>]</pre>The name identifies the backend port to receive the traffic from the global load balancers.<br>Practically, tcp port 80 named "http" works even when not defined here, but it's not a documented provider's behavior. | `list` | `[]` | no |
-| <a name="input_network_interfaces"></a> [network\_interfaces](#input\_network\_interfaces) | List of the network interface specifications.<br>Available options:<br>- `subnetwork`                  - (Required\|string) Self-link of a subnetwork to create interface in.<br>- `private_ip_name`             - (Optional\|string) Name for a private IPv4 address to reserve.<br>- `private_ip`                  - (Optional\|string) Private IPv4 address to reserve.<br>- `create_public_ip`            - (Optional\|boolean) Whether to reserve public IPv4 address for the interface. Ignored if `public_ip` is provided. Defaults to 'false'.<br>- `public_ip_name`              - (Optional\|string) Name for a public IPv4 address to reserve.<br>- `public_ip`                   - (Optional\|string) Existing public IPv4 address to use.<br>- `public_ptr_domain_name`      - (Optional\|string) Existing public IPv4 address PTR name to use.<br>- `alias_ip_ranges`             - (Optional\|list) List of objects that define additional IP ranges for an interface, as specified [here](https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/compute_instance#ip_cidr_range)<br>- `create_public_ipv6`          - (Optional\|boolean) Whether to reserve public IPv6 address for the interface. Ignored if `public_ipv6` is provided. Defaults to 'false'.<br>- `public_ipv6_name`            - (Optional\|string) Name for a public IPv6 address to reserve.<br>- `public_ipv6`                 - (Optional\|string) Existing public IPv6 address to use.<br>- `public_ipv6_ptr_domain_name` - (Optional\|string) Existing public IPv6 address PTR name to use. | `list(any)` | n/a | yes |
+| <a name="input_network_interfaces"></a> [network\_interfaces](#input\_network\_interfaces) | List of the network interface specifications.<br>Available options:<br>- `subnetwork`                  - (Required\|string) Self-link of a subnetwork to create interface in.<br>- `stack_type`                  - (Optional\|string) IP stack to use: IPV4\_ONLY (default) or IPV4\_IPV6.<br>- `private_ip_name`             - (Optional\|string) Name for a private IPv4 address to reserve.<br>- `private_ip`                  - (Optional\|string) Private IPv4 address to reserve.<br>- `create_public_ip`            - (Optional\|boolean) Whether to reserve public IPv4 address for the interface. Ignored if `public_ip` is provided. Defaults to 'false'.<br>- `public_ip_name`              - (Optional\|string) Name for a public IPv4 address to reserve.<br>- `public_ip`                   - (Optional\|string) Existing public IPv4 address to use.<br>- `public_ptr_domain_name`      - (Optional\|string) Existing public IPv4 address PTR name to use.<br>- `alias_ip_ranges`             - (Optional\|list) List of objects that define additional IP ranges for an interface, as specified [here](https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/compute_instance#ip_cidr_range)<br>- `create_public_ipv6`          - (Optional\|boolean) Whether to reserve public IPv6 address for the interface. Ignored if `public_ipv6` is provided. Defaults to 'false'.<br>- `public_ipv6_name`            - (Optional\|string) Name for a public IPv6 address to reserve.<br>- `public_ipv6`                 - (Optional\|string) Existing public IPv6 address to use.<br>- `public_ipv6_ptr_domain_name` - (Optional\|string) Existing public IPv6 address PTR name to use. | `list(any)` | n/a | yes |
 | <a name="input_project"></a> [project](#input\_project) | n/a | `string` | `null` | no |
 | <a name="input_resource_policies"></a> [resource\_policies](#input\_resource\_policies) | n/a | `list(string)` | `[]` | no |
 | <a name="input_scopes"></a> [scopes](#input\_scopes) | n/a | `list(string)` | <pre>[<br>  "https://www.googleapis.com/auth/compute.readonly",<br>  "https://www.googleapis.com/auth/cloud.useraccounts.readonly",<br>  "https://www.googleapis.com/auth/devstorage.read_only",<br>  "https://www.googleapis.com/auth/logging.write",<br>  "https://www.googleapis.com/auth/monitoring.write"<br>]</pre> | no |

modules/vmseries/variables.tf

@@ -18,6 +18,7 @@ variable "network_interfaces" {
   List of the network interface specifications.
   Available options:
   - `subnetwork`                  - (Required|string) Self-link of a subnetwork to create interface in.
+  - `stack_type`                  - (Optional|string) IP stack to use: IPV4_ONLY (default) or IPV4_IPV6.
   - `private_ip_name`             - (Optional|string) Name for a private IPv4 address to reserve.
   - `private_ip`                  - (Optional|string) Private IPv4 address to reserve.
   - `create_public_ip`            - (Optional|boolean) Whether to reserve public IPv4 address for the interface. Ignored if `public_ip` is provided. Defaults to 'false'.