docs: (IAC-977) Update enable_cluster_autoscaling documentation (#188)

docs/CONFIG-VARS.md

@@ -104,7 +104,7 @@ The application of a Kubernetes version in GCP has some limitations when assigni
 | :--- | ---: | ---: | ---: | ---: |
 | kubernetes_version | The GKE cluster K8S version | string | "latest" | Valid values depend on the kubernetes_channel and version required, see https://cloud.google.com/kubernetes-engine/docs/release-notes |
 | kubernetes_channel | The GKE cluster channel for auto-updates | string | "UNSPECIFIED" | Possible values: "STABLE", "REGULAR", "RAPID"; Set "UNSPECIFIED" for no auto-updates |
-| enable_cluster_autoscaling | Enable cluster autoscaling | bool | false | |
+| enable_cluster_autoscaling | Per-cluster configuration of [Node Auto-Provisioning](https://cloud.google.com/kubernetes-engine/docs/how-to/node-auto-provisioning) with Cluster Autoscaler to automatically adjust the size of the cluster and create/delete node pools based on the current needs of the cluster's workload | bool | false | This is different from node autoscaling which is controlled by `max_node` & `min_node` in your [node pool definitions](#Nodepools)|
 | cluster_autoscaling_max_cpu_cores | MAX number of cores in the cluster | number | 500 | |
 | cluster_autoscaling_max_memory_gb | MAX number of gb of memory in the cluster | number | 10000 | |
 | create_static_kubeconfig | Allows the user to create a provider / service account based kube config file | bool | true | A value of `false` will default to using the cloud providers mechanism for generating the kubeconfig file. A value of `true` will create a static kubeconfig which utilizes a `Service Account` and `Cluster Role Binding` to provide credentials. |

variables.tf

@@ -242,7 +242,7 @@ variable "default_nodepool_locations" {
 
 variable "node_pools" {
   description = "Node pool definitions"
-  type = map(object({
+  type        = map(object({
     vm_type           = string
     os_disk_size      = number
     min_nodes         = string
@@ -260,7 +260,7 @@ variable "node_pools" {
       "min_nodes"    = 1
       "max_nodes"    = 5
       "node_taints"  = ["workload.sas.com/class=cas:NoSchedule"]
-      "node_labels" = {
+      "node_labels"  = {
         "workload.sas.com/class" = "cas"
       }
       "local_ssd_count"   = 0
@@ -273,7 +273,7 @@ variable "node_pools" {
       "min_nodes"    = 1
       "max_nodes"    = 5
       "node_taints"  = ["workload.sas.com/class=compute:NoSchedule"]
-      "node_labels" = {
+      "node_labels"  = {
         "workload.sas.com/class"        = "compute"
         "launcher.sas.com/prepullImage" = "sas-programming-environment"
       }
@@ -287,7 +287,7 @@ variable "node_pools" {
       "min_nodes"    = 1
       "max_nodes"    = 5
       "node_taints"  = ["workload.sas.com/class=stateless:NoSchedule"]
-      "node_labels" = {
+      "node_labels"  = {
         "workload.sas.com/class" = "stateless"
       }
       "local_ssd_count"   = 0
@@ -300,7 +300,7 @@ variable "node_pools" {
       "min_nodes"    = 1
       "max_nodes"    = 3
       "node_taints"  = ["workload.sas.com/class=stateful:NoSchedule"]
-      "node_labels" = {
+      "node_labels"  = {
         "workload.sas.com/class" = "stateful"
       }
       "local_ssd_count"   = 0
@@ -327,7 +327,7 @@ variable "nodepools_locations" {
 }
 
 variable "enable_cluster_autoscaling" {
-  description = "Setting this value will enable cluster_autoscaling"
+  description = "Setting this value will enable cluster_autoscaling a per-cluster configuration of Node Auto-Provisioning with Cluster Autoscaler to automatically adjust the size of the cluster and create/delete node pools based on the current needs of the cluster's workload."
   type        = bool
   default     = false
 }
@@ -350,7 +350,7 @@ variable "cluster_autoscaling_max_memory_gb" {
 variable "postgres_server_defaults" {
   description = "default values for a postgres server"
   type        = any
-  default = {
+  default     = {
     machine_type                           = "db-custom-8-30720"
     storage_gb                             = 10
     backups_enabled                        = true