[resource_container_cluster] - Add self-link property

.changelog/3942.txt

@@ -0,0 +1,3 @@
+```release-note:enhancement
+Added self_link to google_container_cluster
+```

google/resource_container_cluster.go

@@ -683,6 +683,12 @@ func resourceContainerCluster() *schema.Resource {
 				Description:      `The name or self_link of the Google Compute Engine subnetwork in which the cluster's instances are launched.`,
 			},
 
+			"self_link": {
+				Type:        schema.TypeString,
+				Computed:    true,
+				Description: `Server-defined URL for the resource.`,
+			},
+
 			"endpoint": {
 				Type:        schema.TypeString,
 				Computed:    true,
@@ -1076,7 +1082,6 @@ func resourceContainerClusterCreate(d *schema.ResourceData, meta interface{}) er
 			ForceSendFields: []string{"Enabled"},
 		},
 		ReleaseChannel: expandReleaseChannel(d.Get("release_channel")),
-
 		MasterAuth:     expandMasterAuth(d.Get("master_auth")),
 		ResourceLabels: expandStringMap(d, "resource_labels"),
 	}
@@ -1320,6 +1325,7 @@ func resourceContainerClusterRead(d *schema.ResourceData, meta interface{}) erro
 	d.Set("node_locations", locations)
 
 	d.Set("endpoint", cluster.Endpoint)
+	d.Set("self_link", cluster.SelfLink)
 	if err := d.Set("maintenance_policy", flattenMaintenancePolicy(cluster.MaintenancePolicy)); err != nil {
 		return err
 	}
@@ -1351,7 +1357,6 @@ func resourceContainerClusterRead(d *schema.ResourceData, meta interface{}) erro
 	if err := d.Set("release_channel", flattenReleaseChannel(cluster.ReleaseChannel)); err != nil {
 		return err
 	}
-
 	if err := d.Set("authenticator_groups_config", flattenAuthenticatorGroupsConfig(cluster.AuthenticatorGroupsConfig)); err != nil {
 		return err
 	}

google/resource_container_cluster_test.go

@@ -72,6 +72,7 @@ func TestAccContainerCluster_basic(t *testing.T) {
 				Config: testAccContainerCluster_basic(clusterName),
 				Check: resource.ComposeAggregateTestCheckFunc(
 					resource.TestCheckResourceAttrSet("google_container_cluster.primary", "services_ipv4_cidr"),
+					resource.TestCheckResourceAttrSet("google_container_cluster.primary", "self_link"),
 				),
 			},
 			{
@@ -2786,7 +2787,7 @@ func testAccContainerCluster_withResourceUsageExportConfig(clusterName, datasetI
 	return fmt.Sprintf(`
 provider "google" {
   user_project_override = true
-}	
+}
 resource "google_bigquery_dataset" "default" {
   dataset_id                 = "%s"
   description                = "gke resource usage dataset tests"

website/docs/r/container_cluster.html.markdown

@@ -9,7 +9,7 @@ description: |-
 
 # google\_container\_cluster
 
--> Visit the [Provision a GKE Cluster (Google Cloud)](https://learn.hashicorp.com/tutorials/terraform/gke?in=terraform/kubernetes&utm_source=WEBSITE&utm_medium=WEB_IO&utm_offer=ARTICLE_PAGE&utm_content=DOCS) Learn tutorial to learn how to provision and interact 
+-> Visit the [Provision a GKE Cluster (Google Cloud)](https://learn.hashicorp.com/tutorials/terraform/gke?in=terraform/kubernetes&utm_source=WEBSITE&utm_medium=WEB_IO&utm_offer=ARTICLE_PAGE&utm_content=DOCS) Learn tutorial to learn how to provision and interact
 with a GKE cluster.
 
 -> See the [Using GKE with Terraform](/docs/providers/google/guides/using_gke_with_terraform.html)
@@ -365,7 +365,7 @@ The `addons_config` block supports:
     All cluster nodes running GKE 1.15 and higher are recreated.**
 
 * `gce_persistent_disk_csi_driver_config` - (Optional, [Beta](https://terraform.io/docs/providers/google/guides/provider_versions.html)).
-    Whether this cluster should enable the Google Compute Engine Persistent Disk Container Storage Interface (CSI) Driver. Defaults to disabled; set `enabled = true` to enable. 
+    Whether this cluster should enable the Google Compute Engine Persistent Disk Container Storage Interface (CSI) Driver. Defaults to disabled; set `enabled = true` to enable.
 
 * `kalm_config` - (Optional, [Beta](https://terraform.io/docs/providers/google/guides/ provider_versions.html)).
     Configuration for the KALM addon, which manages the lifecycle of k8s. It is disabled by default; Set `enabled = true` to enable.
@@ -636,7 +636,7 @@ recommended. Structure is documented below.
 
 * `workload_metadata_config` - (Optional, [Beta](https://terraform.io/docs/providers/google/guides/provider_versions.html)) Metadata configuration to expose to workloads on the node pool.
     Structure is documented below.
-    
+
 * `kubelet_config` - (Optional, [Beta](https://terraform.io/docs/providers/google/guides/provider_versions.html))
 Kubelet configuration, currently supported attributes can be found [here](https://cloud.google.com/sdk/gcloud/reference/beta/container/node-pools/create#--system-config-from-file).
 Structure is documented below.
@@ -817,7 +817,7 @@ The `linux_node_config` block supports:
 
 * `sysctls` - (Required)  The Linux kernel parameters to be applied to the nodes
 and all pods running on the nodes. Specified as a map from the key, such as
-`net.core.wmem_max`, to a string value. 
+`net.core.wmem_max`, to a string value.
 
 The `vertical_pod_autoscaling` block supports:
 
@@ -830,6 +830,8 @@ exported:
 
 * `id` - an identifier for the resource with format `projects/{{project}}/locations/{{zone}}/clusters/{{name}}`
 
+* `self_link` - The server-defined URL for the resource.
+
 * `endpoint` - The IP address of this cluster's Kubernetes master.
 
 * `instance_group_urls` - List of instance group URLs which have been assigned