Cloud Monitoring: Reduce request size when listing labels (#44365)

pkg/tsdb/cloudmonitoring/time_series_query_test.go

@@ -77,4 +77,28 @@ func TestTimeSeriesQuery(t *testing.T) {
 			assert.Equal(t, "test-proj - asia-northeast1-c - 6724404429462225363 - 200", frames[0].Fields[1].Name)
 		})
 	})
+
+	t.Run("Parse labels", func(t *testing.T) {
+		data, err := loadTestFile("./test-data/7-series-response-mql.json")
+		require.NoError(t, err)
+
+		fromStart := time.Date(2018, 3, 15, 13, 0, 0, 0, time.UTC).In(time.Local)
+		res := &backend.DataResponse{}
+		query := &cloudMonitoringTimeSeriesQuery{
+			ProjectName: "test-proj",
+			Query:       "test-query",
+			timeRange: backend.TimeRange{
+				From: fromStart,
+				To:   fromStart.Add(34 * time.Minute),
+			},
+		}
+		err = query.parseResponse(res, data, "")
+		require.NoError(t, err)
+		frames := res.Frames
+		custom, ok := frames[0].Meta.Custom.(map[string]interface{})
+		require.True(t, ok)
+		labels, ok := custom["labels"].(map[string]string)
+		require.True(t, ok)
+		assert.Equal(t, "6724404429462225363", labels["resource.label.instance_id"])
+	})
 }