Add namespacing on metric descriptor so tests can run in parallel (#3771) (#2293)

* Add namespacing on metric descriptor so tests can run in parallel

* Add random generation to type

Signed-off-by: Modular Magician <[email protected]>

Author: modular-magician

.changelog/3771.txt

@@ -0,0 +1,3 @@
+```release-note:none
+
+```

google-beta/resource_monitoring_metric_descriptor_generated_test.go

@@ -52,8 +52,8 @@ func testAccMonitoringMetricDescriptor_monitoringMetricDescriptorBasicExample(co
 	return Nprintf(`
 resource "google_monitoring_metric_descriptor" "basic" {
   description = "Daily sales records from all branch stores."
-  display_name = "Daily sales"
-  type = "custom.googleapis.com/stores/daily_sales"
+  display_name = "tf-test-metric-descriptor%{random_suffix}"
+  type = "custom.googleapis.com/stores/tf_test_daily_sales%{random_suffix}"
   metric_kind = "GAUGE"
   value_type = "DOUBLE"
   unit = "{USD}"
@@ -100,15 +100,15 @@ func testAccMonitoringMetricDescriptor_monitoringMetricDescriptorAlertExample(co
 	return Nprintf(`
 resource "google_monitoring_metric_descriptor" "with_alert" {
   description = "Daily sales records from all branch stores."
-  display_name = "Daily sales"
-  type = "custom.googleapis.com/stores/daily_sales"
+  display_name = "tf-test-metric-descriptor%{random_suffix}"
+  type = "custom.googleapis.com/stores/tf_test_daily_sales%{random_suffix}"
   metric_kind = "GAUGE"
   value_type = "DOUBLE"
   unit = "{USD}"
 }
 
 resource "google_monitoring_alert_policy" "alert_policy" {
-  display_name = "Alert on daily sales"
+  display_name = "tf-test-metric-descriptor%{random_suffix}"
   combiner     = "OR"
   conditions {
     display_name = "test condition"

website/docs/r/monitoring_metric_descriptor.html.markdown

@@ -42,7 +42,7 @@ To get more information about MetricDescriptor, see:
 ```hcl
 resource "google_monitoring_metric_descriptor" "basic" {
   description = "Daily sales records from all branch stores."
-  display_name = "Daily sales"
+  display_name = "metric-descriptor"
   type = "custom.googleapis.com/stores/daily_sales"
   metric_kind = "GAUGE"
   value_type = "DOUBLE"
@@ -70,15 +70,15 @@ resource "google_monitoring_metric_descriptor" "basic" {
 ```hcl
 resource "google_monitoring_metric_descriptor" "with_alert" {
   description = "Daily sales records from all branch stores."
-  display_name = "Daily sales"
+  display_name = "metric-descriptor"
   type = "custom.googleapis.com/stores/daily_sales"
   metric_kind = "GAUGE"
   value_type = "DOUBLE"
   unit = "{USD}"
 }
 
 resource "google_monitoring_alert_policy" "alert_policy" {
-  display_name = "Alert on daily sales"
+  display_name = "metric-descriptor"
   combiner     = "OR"
   conditions {
     display_name = "test condition"