fix tags cause notebooks instances to recreate

.changelog/10179.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+notebooks: fixed an issue where default tags would cause a diff recreating `google_notebooks_instance` resources
+```

google/services/notebooks/resource_notebooks_instance.go

@@ -40,8 +40,22 @@ var NotebooksInstanceProvidedScopes = []string{
 	"https://www.googleapis.com/auth/userinfo.email",
 }
 
+var NotebooksInstanceProvidedTags = []string{
+	"deeplearning-vm",
+	"notebook-instance",
+}
+
 func NotebooksInstanceScopesDiffSuppress(_, _, _ string, d *schema.ResourceData) bool {
-	old, new := d.GetChange("service_account_scopes")
+	return NotebooksDiffSuppressTemplate("service_account_scopes", NotebooksInstanceProvidedScopes, d)
+}
+
+func NotebooksInstanceTagsDiffSuppress(_, _, _ string, d *schema.ResourceData) bool {
+	return NotebooksDiffSuppressTemplate("tags", NotebooksInstanceProvidedTags, d)
+}
+
+func NotebooksDiffSuppressTemplate(field string, defaults []string, d *schema.ResourceData) bool {
+	old, new := d.GetChange(field)
+
 	oldValue := old.([]interface{})
 	newValue := new.([]interface{})
 	oldValueList := []string{}
@@ -54,7 +68,7 @@ func NotebooksInstanceScopesDiffSuppress(_, _, _ string, d *schema.ResourceData)
 	for _, item := range newValue {
 		newValueList = append(newValueList, item.(string))
 	}
-	newValueList = append(newValueList, NotebooksInstanceProvidedScopes...)
+	newValueList = append(newValueList, defaults...)
 
 	sort.Strings(oldValueList)
 	sort.Strings(newValueList)
@@ -469,11 +483,12 @@ Enabled by default.`,
 Format: projects/{project_id}/regions/{region}/subnetworks/{subnetwork_id}`,
 			},
 			"tags": {
-				Type:        schema.TypeList,
-				Computed:    true,
-				Optional:    true,
-				ForceNew:    true,
-				Description: `The Compute Engine tags to add to instance.`,
+				Type:             schema.TypeList,
+				Computed:         true,
+				Optional:         true,
+				ForceNew:         true,
+				DiffSuppressFunc: NotebooksInstanceTagsDiffSuppress,
+				Description:      `The Compute Engine tags to add to instance.`,
 				Elem: &schema.Schema{
 					Type: schema.TypeString,
 				},

google/services/notebooks/resource_notebooks_instance_generated_test.go

@@ -263,6 +263,9 @@ resource "google_notebooks_instance" "instance" {
     "https://www.googleapis.com/auth/cloud-platform",
     "https://www.googleapis.com/auth/userinfo.email"
   ]
+
+  tags = ["foo", "bar"]
+
   disk_encryption = "CMEK"
   kms_key         = "%{key_name}"
   desired_state = "ACTIVE"

website/docs/r/notebooks_instance.html.markdown

@@ -161,6 +161,9 @@ resource "google_notebooks_instance" "instance" {
     "https://www.googleapis.com/auth/cloud-platform",
     "https://www.googleapis.com/auth/userinfo.email"
   ]
+
+  tags = ["foo", "bar"]
+
   disk_encryption = "CMEK"
   kms_key         = "my-crypto-key"
   desired_state = "ACTIVE"