Remove project id labels from Exporter (#832)

(cherry picked from commit a5bac64)

Author: songy23

exporters/stats/stackdriver/src/main/java/io/opencensus/exporter/stats/stackdriver/StackdriverExportUtils.java

@@ -148,8 +148,8 @@ static List<TimeSeries> createTimeSeriesList(ViewData viewData, String projectId
     // Shared fields for all TimeSeries generated from the same ViewData
     TimeSeries.Builder shared = TimeSeries.newBuilder();
     shared.setMetricKind(createMetricKind(view.getWindow()));
-    shared.setResource(
-        MonitoredResource.newBuilder().setType("global").putLabels("project_id", projectId));
+    // TODO(songya): add support for custom resource labels.
+    shared.setResource(MonitoredResource.newBuilder().setType("global"));
     shared.setValueType(createValueType(view.getAggregation(), view.getMeasure()));
 
     // Each entry in AggregationMap will be converted into an independent TimeSeries object

exporters/stats/stackdriver/src/test/java/io/opencensus/exporter/stats/stackdriver/StackdriverExportUtilsTest.java

@@ -336,10 +336,7 @@ public void createTimeSeriesList_cumulative() {
             .setMetricKind(MetricKind.CUMULATIVE)
             .setValueType(MetricDescriptor.ValueType.DISTRIBUTION)
             .setMetric(StackdriverExportUtils.createMetric(view, Arrays.asList(VALUE_1)))
-            .setResource(
-                MonitoredResource.newBuilder()
-                    .setType("global")
-                    .putLabels("project_id", PROJECT_ID))
+            .setResource(MonitoredResource.newBuilder().setType("global"))
             .addPoints(
                 StackdriverExportUtils.createPoint(distributionData1, cumulativeData, DISTRIBUTION))
             .build();
@@ -348,10 +345,7 @@ public void createTimeSeriesList_cumulative() {
             .setMetricKind(MetricKind.CUMULATIVE)
             .setValueType(MetricDescriptor.ValueType.DISTRIBUTION)
             .setMetric(StackdriverExportUtils.createMetric(view, Arrays.asList(VALUE_2)))
-            .setResource(
-                MonitoredResource.newBuilder()
-                    .setType("global")
-                    .putLabels("project_id", PROJECT_ID))
+            .setResource(MonitoredResource.newBuilder().setType("global"))
             .addPoints(
                 StackdriverExportUtils.createPoint(distributionData2, cumulativeData, DISTRIBUTION))
             .build();