Fix monitoring tests (GoogleCloudPlatform#799)

* Fix monitoring tests

Author: waprin

monitoring/api/v3/cloud-client/quickstart.py

@@ -29,9 +29,7 @@ def run_quickstart():
 
     metric = client.metric(
         type_='custom.googleapis.com/my_metric',
-        labels={
-            'status': 'successful',
-        }
+        labels={}
     )
 
     client.write_point(metric, resource, 3.14)

monitoring/api/v3/cloud-client/snippets.py

@@ -54,7 +54,6 @@ def write_time_series():
     metric = client.metric(
         type_='custom.googleapis.com/my_metric',
         labels={
-            'status': 'successful',
         }
     )
     client.write_point(metric, resource, 3.14)

monitoring/api/v3/cloud-client/snippets_test.py

@@ -19,7 +19,7 @@ def test_create_get_delete_metric_descriptor(capsys):
     snippets.create_metric_descriptor()
     snippets.get_metric_descriptor('custom.googleapis.com/my_metric')
     out, _ = capsys.readouterr()
-    assert 'a simple example' in out
+    assert "value_type='DOUBLE'" in out
     snippets.delete_metric_descriptor('custom.googleapis.com/my_metric')
     out, _ = capsys.readouterr()
     assert 'Deleted metric' in out