feature: add gpu node autoscaling support (terraform-google-modules#807)

* add gpu node autoscaling support for top level module

* add gpu node autoscaling support for beta-private-cluster module

main.tf

@@ -51,15 +51,15 @@ locals {
 
   release_channel = var.release_channel != null ? [{ channel : var.release_channel }] : []
 
-  autoscaling_resource_limits = var.cluster_autoscaling.enabled ? [{
+  autoscaling_resource_limits = var.cluster_autoscaling.enabled ? concat([{
     resource_type = "cpu"
     minimum       = var.cluster_autoscaling.min_cpu_cores
     maximum       = var.cluster_autoscaling.max_cpu_cores
     }, {
     resource_type = "memory"
     minimum       = var.cluster_autoscaling.min_memory_gb
     maximum       = var.cluster_autoscaling.max_memory_gb
-  }] : []
+  }], var.cluster_autoscaling.gpu_resources) : []
 
 
   custom_kube_dns_config      = length(keys(var.stub_domains)) > 0

modules/beta-private-cluster/main.tf

@@ -51,15 +51,15 @@ locals {
 
   release_channel = var.release_channel != null ? [{ channel : var.release_channel }] : []
 
-  autoscaling_resource_limits = var.cluster_autoscaling.enabled ? [{
+  autoscaling_resource_limits = var.cluster_autoscaling.enabled ? concat([{
     resource_type = "cpu"
     minimum       = var.cluster_autoscaling.min_cpu_cores
     maximum       = var.cluster_autoscaling.max_cpu_cores
     }, {
     resource_type = "memory"
     minimum       = var.cluster_autoscaling.min_memory_gb
     maximum       = var.cluster_autoscaling.max_memory_gb
-  }] : []
+  }], var.cluster_autoscaling.gpu_resources) : []
 
 
   custom_kube_dns_config      = length(keys(var.stub_domains)) > 0

modules/beta-private-cluster/variables.tf

@@ -241,6 +241,11 @@ variable "cluster_autoscaling" {
     max_cpu_cores       = number
     min_memory_gb       = number
     max_memory_gb       = number
+    gpu_resources       = list(object({
+      resource_type = string
+      minimum       = number
+      maximum       = number
+    }))
   })
   default = {
     enabled             = false
@@ -249,6 +254,7 @@ variable "cluster_autoscaling" {
     min_cpu_cores       = 0
     max_memory_gb       = 0
     min_memory_gb       = 0
+    gpu_resources       = []
   }
   description = "Cluster autoscaling configuration. See [more details](https://cloud.google.com/kubernetes-engine/docs/reference/rest/v1beta1/projects.locations.clusters#clusterautoscaling)"
 }

variables.tf

@@ -207,13 +207,19 @@ variable "cluster_autoscaling" {
     max_cpu_cores = number
     min_memory_gb = number
     max_memory_gb = number
+    gpu_resources = list(object({
+      resource_type = string
+      minimum       = number
+      maximum       = number
+    }))
   })
   default = {
     enabled       = false
     max_cpu_cores = 0
     min_cpu_cores = 0
     max_memory_gb = 0
     min_memory_gb = 0
+    gpu_resources = []
   }
   description = "Cluster autoscaling configuration. See [more details](https://cloud.google.com/kubernetes-engine/docs/reference/rest/v1beta1/projects.locations.clusters#clusterautoscaling)"
 }