feat: Add support for desired_capacity_type (named desired_size_type) on self-managed node group (#3166)

* set desired_capacity_type

* fix: Add variable with `null` type and pass through node group

---------

Co-authored-by: Bryant Biggs <bryantbiggs@gmail.com>

modules/self-managed-node-group/README.md

@@ -117,6 +117,7 @@ module "self_managed_node_group" {
 | <a name="input_default_instance_warmup"></a> [default\_instance\_warmup](#input\_default\_instance\_warmup) | Amount of time, in seconds, until a newly launched instance can contribute to the Amazon CloudWatch metrics. This delay lets an instance finish initializing before Amazon EC2 Auto Scaling aggregates instance metrics, resulting in more reliable usage data | `number` | `null` | no |
 | <a name="input_delete_timeout"></a> [delete\_timeout](#input\_delete\_timeout) | Delete timeout to wait for destroying autoscaling group | `string` | `null` | no |
 | <a name="input_desired_size"></a> [desired\_size](#input\_desired\_size) | The number of Amazon EC2 instances that should be running in the autoscaling group | `number` | `1` | no |
+| <a name="input_desired_size_type"></a> [desired\_size\_type](#input\_desired\_size\_type) | The unit of measurement for the value specified for `desired_size`. Supported for attribute-based instance type selection only. Valid values: `units`, `vcpu`, `memory-mib` | `string` | `null` | no |
 | <a name="input_disable_api_termination"></a> [disable\_api\_termination](#input\_disable\_api\_termination) | If true, enables EC2 instance termination protection | `bool` | `null` | no |
 | <a name="input_ebs_optimized"></a> [ebs\_optimized](#input\_ebs\_optimized) | If true, the launched EC2 instance will be EBS-optimized | `bool` | `null` | no |
 | <a name="input_elastic_gpu_specifications"></a> [elastic\_gpu\_specifications](#input\_elastic\_gpu\_specifications) | The elastic GPU to attach to the instance | `any` | `{}` | no |

modules/self-managed-node-group/main.tf

@@ -502,6 +502,7 @@ resource "aws_autoscaling_group" "this" {
   default_cooldown          = var.default_cooldown
   default_instance_warmup   = var.default_instance_warmup
   desired_capacity          = var.desired_size
+  desired_capacity_type     = var.desired_size_type
   enabled_metrics           = var.enabled_metrics
   force_delete              = var.force_delete
   force_delete_warm_pool    = var.force_delete_warm_pool

modules/self-managed-node-group/variables.tf

@@ -420,6 +420,12 @@ variable "desired_size" {
   default     = 1
 }
 
+variable "desired_size_type" {
+  description = "The unit of measurement for the value specified for `desired_size`. Supported for attribute-based instance type selection only. Valid values: `units`, `vcpu`, `memory-mib`"
+  type        = string
+  default     = null
+}
+
 variable "ignore_failed_scaling_activities" {
   description = "Whether to ignore failed Auto Scaling scaling activities while waiting for capacity."
   type        = bool

node_groups.tf

@@ -435,6 +435,7 @@ module "self_managed_node_group" {
   min_size                  = try(each.value.min_size, var.self_managed_node_group_defaults.min_size, 0)
   max_size                  = try(each.value.max_size, var.self_managed_node_group_defaults.max_size, 3)
   desired_size              = try(each.value.desired_size, var.self_managed_node_group_defaults.desired_size, 1)
+  desired_size_type         = try(each.value.desired_size_type, var.self_managed_node_group_defaults.desired_size_type, null)
   capacity_rebalance        = try(each.value.capacity_rebalance, var.self_managed_node_group_defaults.capacity_rebalance, null)
   min_elb_capacity          = try(each.value.min_elb_capacity, var.self_managed_node_group_defaults.min_elb_capacity, null)
   wait_for_elb_capacity     = try(each.value.wait_for_elb_capacity, var.self_managed_node_group_defaults.wait_for_elb_capacity, null)