Prevent permadiff on monitoring_uptime_check_config

google/services/monitoring/resource_monitoring_uptime_check_config.go

@@ -38,6 +38,15 @@ func resourceMonitoringUptimeCheckConfigHttpCheckPathDiffSuppress(k, old, new st
 	return old == "/"+new
 }
 
+func resourceMonitoringUptimeCheckConfigMonitoredResourceLabelsDiffSuppress(k, old, new string, d *schema.ResourceData) bool {
+	// GCP adds the project_id to the labels if unset.
+	// We want to suppress the diff if not set in the config.
+	if strings.HasSuffix(k, "project_id") && new == "" && old != "" {
+		return true
+	}
+	return false
+}
+
 func ResourceMonitoringUptimeCheckConfig() *schema.Resource {
 	return &schema.Resource{
 		Create: resourceMonitoringUptimeCheckConfigCreate,
@@ -287,11 +296,12 @@ uptime checks:
 				Elem: &schema.Resource{
 					Schema: map[string]*schema.Schema{
 						"labels": {
-							Type:        schema.TypeMap,
-							Required:    true,
-							ForceNew:    true,
-							Description: `Values for all of the labels listed in the associated monitored resource descriptor. For example, Compute Engine VM instances use the labels 'project_id', 'instance_id', and 'zone'.`,
-							Elem:        &schema.Schema{Type: schema.TypeString},
+							Type:             schema.TypeMap,
+							Required:         true,
+							ForceNew:         true,
+							DiffSuppressFunc: resourceMonitoringUptimeCheckConfigMonitoredResourceLabelsDiffSuppress,
+							Description:      `Values for all of the labels listed in the associated monitored resource descriptor. For example, Compute Engine VM instances use the labels 'project_id', 'instance_id', and 'zone'.`,
+							Elem:             &schema.Schema{Type: schema.TypeString},
 						},
 						"type": {
 							Type:        schema.TypeString,

google/services/monitoring/resource_monitoring_uptime_check_config_test.go

@@ -43,6 +43,34 @@ func TestAccMonitoringUptimeCheckConfig_update(t *testing.T) {
 	})
 }
 
+func TestAccMonitoringUptimeCheckConfig_noProjectId(t *testing.T) {
+	t.Parallel()
+	host := "192.168.1.1"
+	suffix := acctest.RandString(t, 4)
+
+	acctest.VcrTest(t, resource.TestCase{
+		PreCheck:                 func() { acctest.AccTestPreCheck(t) },
+		ProtoV5ProviderFactories: acctest.ProtoV5ProviderFactories(t),
+		CheckDestroy:             testAccCheckMonitoringUptimeCheckConfigDestroyProducer(t),
+		Steps: []resource.TestStep{
+			{
+				Config: testAccMonitoringUptimeCheckConfig_noProjectId(suffix, host),
+			},
+			{
+				ResourceName:            "google_monitoring_uptime_check_config.http",
+				ImportState:             true,
+				ImportStateVerify:       true,
+				ImportStateVerifyIgnore: []string{"http_check.0.auth_info.0.password"},
+			},
+			{
+				Config:       testAccMonitoringUptimeCheckConfig_noProjectId(suffix, host),
+				PlanOnly:     true,
+				ResourceName: "google_monitoring_uptime_check_config.http",
+			},
+		},
+	})
+}
+
 // The second update should force a recreation of the uptime check because 'monitored_resource' isn't
 // updatable in place
 func TestAccMonitoringUptimeCheckConfig_changeNonUpdatableFields(t *testing.T) {
@@ -182,3 +210,36 @@ resource "google_monitoring_uptime_check_config" "http" {
 `, suffix, project, host, content, json_path, json_path_matcher,
 	)
 }
+
+func testAccMonitoringUptimeCheckConfig_noProjectId(suffix, host string) string {
+	return fmt.Sprintf(`
+resource "google_monitoring_uptime_check_config" "http" {
+  display_name = "http-uptime-check-%s"
+  timeout      = "60s"
+  period       = "60s"
+
+  http_check {
+    path = "/mypath"
+    port = "8010"
+    request_method = "GET"
+    auth_info {
+      username = "name"
+      password = "mypassword"
+    }
+  }
+
+  monitored_resource {
+    type = "uptime_url"
+    labels = {
+      host       = "%s"
+    }
+  }
+
+  content_matchers {
+    content = "example"
+    matcher = "CONTAINS_STRING"
+  }
+}
+`, suffix, host,
+	)
+}