Variant Assignment Percentage Fix

featuremanagement/azuremonitor/_send_telemetry.py

@@ -77,10 +77,12 @@ def publish_telemetry(evaluation_event: EvaluationEvent) -> None:
 
     # VariantAllocationPercentage
     allocation_percentage = 0
-    if reason == VariantAssignmentReason.DEFAULT_WHEN_ENABLED and feature.allocation and feature.allocation.percentile:
-        for allocation in feature.allocation.percentile:
-            allocation_percentage += allocation.percentile_to - allocation.percentile_from
-        event["VariantAssignmentPercentage"] = str(100 - allocation_percentage)
+    if reason == VariantAssignmentReason.DEFAULT_WHEN_ENABLED:
+        event["VariantAssignmentPercentage"] = str(100)
+        if feature.allocation:
+            for allocation in feature.allocation.percentile:
+                allocation_percentage += allocation.percentile_to - allocation.percentile_from
+            event["VariantAssignmentPercentage"] = str(100 - allocation_percentage)
     elif reason == VariantAssignmentReason.PERCENTILE:
         if feature.allocation and feature.allocation.percentile:
             for allocation in feature.allocation.percentile:

tests/test_send_telemetry_appinsights.py

@@ -47,6 +47,7 @@ def test_send_telemetry_appinsights(self):
             assert mock_track_event.call_args[0][1]["TargetingId"] == "test_user"
             assert mock_track_event.call_args[0][1]["Variant"] == "TestVariant"
             assert mock_track_event.call_args[0][1]["VariantAssignmentReason"] == "DefaultWhenDisabled"
+            assert "VariantAssignmentPercentage" not in mock_track_event.call_args[0][1]
             assert mock_track_event.call_args[0][1]["ETag"] == "cmwBRcIAq1jUyKL3Kj8bvf9jtxBrFg-R-ayExStMC90"
             assert (
                 mock_track_event.call_args[0][1]["FeatureFlagReference"]
@@ -77,6 +78,7 @@ def test_send_telemetry_appinsights_no_user(self):
             assert "TargetingId" not in mock_track_event.call_args[0][1]
             assert mock_track_event.call_args[0][1]["Variant"] == "TestVariant"
             assert mock_track_event.call_args[0][1]["VariantAssignmentReason"] == "DefaultWhenDisabled"
+            assert "VariantAssignmentPercentage" not in mock_track_event.call_args[0][1]
             assert "DefaultWhenEnabled" not in mock_track_event.call_args[0][1]
 
     def test_send_telemetry_appinsights_no_variant(self):
@@ -145,6 +147,39 @@ def test_send_telemetry_appinsights_default_when_enabled(self):
             assert "DefaultWhenEnabled" in mock_track_event.call_args[0][1]
             assert mock_track_event.call_args[0][1]["DefaultWhenEnabled"] == "big"
 
+    def test_send_telemetry_appinsights_default_when_enabled_no_percentile(self):
+        feature_flag = FeatureFlag.convert_from_json(
+            {
+                "id": "TestFeature",
+                "allocation": {
+                    "default_when_enabled": "big",
+                },
+            }
+        )
+        evaluation_event = EvaluationEvent(feature_flag)
+        variant = Variant("big", None)
+        evaluation_event.feature = feature_flag
+        evaluation_event.enabled = True
+        evaluation_event.user = "test_user"
+        evaluation_event.variant = variant
+        evaluation_event.reason = VariantAssignmentReason.DEFAULT_WHEN_ENABLED
+
+        with patch("featuremanagement.azuremonitor._send_telemetry.azure_monitor_track_event") as mock_track_event:
+            # This is called like this so we can override the track_event function
+            featuremanagement.azuremonitor._send_telemetry.publish_telemetry(  # pylint: disable=protected-access
+                evaluation_event
+            )
+            mock_track_event.assert_called_once()
+            assert mock_track_event.call_args[0][0] == "FeatureEvaluation"
+            assert mock_track_event.call_args[0][1]["FeatureName"] == "TestFeature"
+            assert mock_track_event.call_args[0][1]["Enabled"] == "True"
+            assert mock_track_event.call_args[0][1]["TargetingId"] == "test_user"
+            assert mock_track_event.call_args[0][1]["Variant"] == "big"
+            assert mock_track_event.call_args[0][1]["VariantAssignmentReason"] == "DefaultWhenEnabled"
+            assert mock_track_event.call_args[0][1]["VariantAssignmentPercentage"] == "100"
+            assert "DefaultWhenEnabled" in mock_track_event.call_args[0][1]
+            assert mock_track_event.call_args[0][1]["DefaultWhenEnabled"] == "big"
+
     def test_send_telemetry_appinsights_allocation(self):
         feature_flag = FeatureFlag.convert_from_json(
             {