Add node group autoscaling policy (#3230)

* Add node group autoscaling policy

* add default_from_api

* Update api.yaml

products/compute/api.yaml

@@ -7358,6 +7358,38 @@ objects:
           The total number of nodes in the node group.
         required: true
         send_empty_value: true
+      - !ruby/object:Api::Type::NestedObject
+        name: 'autoscalingPolicy'
+        min_version: beta
+        description: |
+          If you use sole-tenant nodes for your workloads, you can use the node
+          group autoscaler to automatically manage the sizes of your node groups.
+        properties:
+          - !ruby/object:Api::Type::Enum
+            name: 'mode'
+            required: true
+            description: |
+              The autoscaling mode. Set to one of the following:
+                - OFF: Disables the autoscaler.
+                - ON: Enables scaling in and scaling out.
+                - ONLY_SCALE_OUT: Enables only scaling out. 
+                You must use this mode if your node groups are configured to 
+                restart their hosted VMs on minimal servers.
+            values:
+              - :OFF
+              - :ON
+              - :ONLY_SCALE_OUT
+          - !ruby/object:Api::Type::Integer
+            name: 'minNodes'
+            description: |
+              Minimum size of the node group. Must be less 
+              than or equal to max-nodes. The default value is 0.
+          - !ruby/object:Api::Type::Integer
+            name: 'maxNodes'
+            description: |
+              Maximum size of the node group. Set to a value less than or equal
+              to 100 and greater than or equal to min-nodes.
+            required: true
   - !ruby/object:Api::Resource
     name: 'NetworkPeeringRoutesConfig'
     base_url:  'projects/{{project}}/global/networks/{{network}}'

products/compute/terraform.yaml

@@ -1119,11 +1119,26 @@ overrides: !ruby/object:Overrides::ResourceOverrides
         vars:
           group_name: "soletenant-group"
           template_name: "soletenant-tmpl"
+      - !ruby/object:Provider::Terraform::Examples
+        name: "node_group_autoscaling_policy"
+        min_version: beta
+        primary_resource_id: "nodes"
+        vars:
+          group_name: "soletenant-group"
+          template_name: "soletenant-tmpl"
     properties:
       zone: !ruby/object:Overrides::Terraform::PropertyOverride
         required: false
         default_from_api: true
         custom_flatten: 'templates/terraform/custom_flatten/name_from_self_link.erb'
+      autoscalingPolicy: !ruby/object:Overrides::Terraform::PropertyOverride
+        default_from_api: true
+      autoscalingPolicy.mode: !ruby/object:Overrides::Terraform::PropertyOverride
+        default_from_api: true
+      autoscalingPolicy.minNodes: !ruby/object:Overrides::Terraform::PropertyOverride
+        default_from_api: true
+      autoscalingPolicy.maxNodes: !ruby/object:Overrides::Terraform::PropertyOverride
+        default_from_api: true
   NodeTemplate: !ruby/object:Overrides::Terraform::ResourceOverride
     examples:
       - !ruby/object:Provider::Terraform::Examples

templates/terraform/examples/node_group_autoscaling_policy.tf.erb

@@ -0,0 +1,26 @@
+data "google_compute_node_types" "central1a" {
+  provider = google-beta
+  zone = "us-central1-a"
+}
+
+resource "google_compute_node_template" "soletenant-tmpl" {
+  provider = google-beta
+  name      = "<%= ctx[:vars]['template_name'] %>"
+  region    = "us-central1"
+  node_type = data.google_compute_node_types.central1a.names[0]
+}
+
+resource "google_compute_node_group" "<%= ctx[:primary_resource_id] %>" {
+  provider = google-beta
+  name        = "<%= ctx[:vars]['group_name'] %>"
+  zone        = "us-central1-a"
+  description = "example google_compute_node_group for Terraform Google Provider"
+
+  size          = 1
+  node_template = google_compute_node_template.soletenant-tmpl.self_link
+  autoscaling_policy {
+    mode = "ON"
+    min_nodes = 1
+    max_nodes = 10
+  }
+}