fix: Improve Data explorer unit support

internal/dynatrace/metrics_processing.go

@@ -387,7 +387,7 @@ func (p *ConvertUnitMetricsProcessingDecorator) ProcessRequest(ctx context.Conte
 		return nil, err
 	}
 
-	if p.targetUnitID == "" {
+	if !doesTargetUnitRequireConversion(p.targetUnitID) {
 		return result, nil
 	}
 
@@ -398,6 +398,10 @@ func (p *ConvertUnitMetricsProcessingDecorator) ProcessRequest(ctx context.Conte
 	}
 
 	sourceUnitID := metricDefinition.Unit
+	if sourceUnitID == p.targetUnitID {
+		return result, nil
+	}
+
 	convertedResults := make([]MetricsProcessingResult, len(result.Results()))
 	for i, r := range result.results {
 		v, err := p.unitsClient.Convert(ctx, NewMetricsUnitsClientConvertRequest(sourceUnitID, r.value, p.targetUnitID))
@@ -409,3 +413,17 @@ func (p *ConvertUnitMetricsProcessingDecorator) ProcessRequest(ctx context.Conte
 	}
 	return newMetricsProcessingResults(result.Request(), convertedResults, result.Warnings()), nil
 }
+
+const emptyUnitID = ""
+const autoUnitID = "auto"
+const noneUnitID = "none"
+
+// doesTargetUnitRequireConversion checks if the target unit ID requires conversion or not. Currently, "Auto" (default empty value and explicit `auto` value) and "None" require no conversion.
+func doesTargetUnitRequireConversion(targetUnitID string) bool {
+	switch targetUnitID {
+	case emptyUnitID, autoUnitID, noneUnitID:
+		return false
+	default:
+		return true
+	}
+}

internal/sli/get_sli_triggered_event_handler_retrieve_metrics_from_dashboard_data_explorer_test.go

@@ -530,21 +530,79 @@ func TestRetrieveMetricsFromDashboardDataExplorerTile_MultipleTileConfigurationP
 	runGetSLIsFromDashboardTestAndCheckSLIs(t, handler, testGetSLIEventData, getSLIFinishedEventFailureAssertionsFunc, createFailedSLIResultAssertionsFunc("srt", "error parsing SLO definition", "tile has 2 queries enabled but only one is supported", "tile has no metric expressions"))
 }
 
-// TestRetrieveMetricsFromDashboardDataExplorerTile_UnitTransformMilliseconds tests that unit transform works as expected.
-func TestRetrieveMetricsFromDashboardDataExplorerTile_UnitTransformMilliseconds(t *testing.T) {
-	const testDataFolder = "./testdata/dashboards/data_explorer/unit_transform_milliseconds/"
+// TestRetrieveMetricsFromDashboardDataExplorerTile_UnitTransformSuccess tests that unit transform works as expected.
+func TestRetrieveMetricsFromDashboardDataExplorerTile_UnitTransformSuccess(t *testing.T) {
+	const testDataFolder = "./testdata/dashboards/data_explorer/unit_transform_success/"
 
-	handler, expectedMetricsRequest := createHandlerForSuccessfulDataExplorerTestWithResolutionInf(t,
-		testDataFolder,
-		newMetricsV2QueryRequestBuilder("(builtin:service.response.time:splitBy():avg:auto:sort(value(avg,descending)):limit(10)):limit(100):names"),
-	)
-	handler.AddExact(buildMetricsUnitsConvertRequest("MicroSecond", 54896.48858596068, "MilliSecond"), filepath.Join(testDataFolder, "metrics_units_convert1.json"))
+	requestBuilder := newMetricsV2QueryRequestBuilder("(builtin:service.response.time:splitBy():avg:auto:sort(value(avg,descending)):limit(10)):limit(100):names")
 
-	sliResultsAssertionsFuncs := []func(t *testing.T, actual sliResult){
-		createSuccessfulSLIResultAssertionsFunc("srt_milliseconds", 54.89648858596068, expectedMetricsRequest),
+	tests := []struct {
+		name               string
+		unit               string
+		requiresConversion bool
+		expectedSLIValue   float64
+	}{
+		{
+			name:               "empty",
+			unit:               "",
+			requiresConversion: false,
+			expectedSLIValue:   54896.48640187603,
+		},
+		{
+			name:               "auto",
+			unit:               "auto",
+			requiresConversion: false,
+			expectedSLIValue:   54896.48640187603,
+		},
+		{
+			name:               "none",
+			unit:               "none",
+			requiresConversion: false,
+			expectedSLIValue:   54896.48640187603,
+		},
+		{
+			name:               "millisecond",
+			unit:               "MilliSecond",
+			requiresConversion: true,
+			expectedSLIValue:   54.896486401876025,
+		},
+		{
+
+			name:               "microsecond",
+			unit:               "MicroSecond",
+			requiresConversion: false,
+			expectedSLIValue:   54896.48640187603,
+		},
+		{
+			name:               "day",
+			unit:               "Day",
+			requiresConversion: true,
+			expectedSLIValue:   6.353760000217132e-7,
+		},
 	}
 
-	runGetSLIsFromDashboardTestAndCheckSLIs(t, handler, testGetSLIEventData, getSLIFinishedEventSuccessAssertionsFunc, sliResultsAssertionsFuncs...)
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+
+			handler := createHandlerWithTemplatedDashboard(t,
+				filepath.Join(testDataFolder, "dashboard.template.json"),
+				struct {
+					Unit string
+				}{
+					Unit: tt.unit,
+				})
+
+			testVariantDataFolder := filepath.Join(testDataFolder, tt.name)
+
+			metricsRequest := addRequestsToHandlerForSuccessfulMetricsQueryWithResolutionInf(handler, testVariantDataFolder, requestBuilder)
+
+			if tt.requiresConversion {
+				handler.AddExactFile(buildMetricsUnitsConvertRequest("MicroSecond", 54896.48640187603, tt.unit), filepath.Join(testVariantDataFolder, "metrics_units_convert1.json"))
+			}
+
+			runGetSLIsFromDashboardTestAndCheckSLIs(t, handler, testGetSLIEventData, getSLIFinishedEventSuccessAssertionsFunc, createSuccessfulSLIResultAssertionsFunc("srt", tt.expectedSLIValue, metricsRequest))
+		})
+	}
 }
 
 // TestRetrieveMetricsFromDashboardDataExplorerTile_UnitTransformError tests that a unit transform with an invalid unit generates the expected error.