pkg/trace/event: lower-case all keys for legacy extractors

pkg/trace/config/config.go

@@ -101,7 +101,7 @@ type AgentConfig struct {
 	// It maps tag keys to a set of replacements. Only supported in A6.
 	ReplaceTags []*ReplaceRule
 
-	// transaction analytics, all map keys are lower-cased by Viper.
+	// transaction analytics
 	AnalyzedRateByServiceLegacy map[string]float64
 	AnalyzedSpansByService      map[string]map[string]float64
 

pkg/trace/event/extractor_fixed_rate.go

@@ -15,11 +15,17 @@ type fixedRateExtractor struct {
 
 // NewFixedRateExtractor returns an APM event extractor that decides whether to extract APM events from spans following
 // the provided extraction rates for a span's (service name, operation name) pair.
-// The map keys must strictly be lower-cased, as provided by Viper.
 func NewFixedRateExtractor(rateByServiceAndName map[string]map[string]float64) Extractor {
-	return &fixedRateExtractor{
-		rateByServiceAndName: rateByServiceAndName,
+	// lower-case keys for case insensitive matching (see #3113)
+	rbs := make(map[string]map[string]float64, len(rateByServiceAndName))
+	for service, opRates := range rateByServiceAndName {
+		k := strings.ToLower(service)
+		rbs[k] = make(map[string]float64, len(opRates))
+		for op, rate := range opRates {
+			rbs[k][strings.ToLower(op)] = rate
+		}
 	}
+	return &fixedRateExtractor{rateByServiceAndName: rbs}
 }
 
 // Extract decides to extract an apm event from a span if its service and name have a corresponding extraction rate

pkg/trace/event/extractor_fixed_rate_test.go

@@ -19,8 +19,8 @@ func createTestSpans(serviceName string, operationName string) []*pb.Span {
 func TestFixedCases(t *testing.T) {
 	assert := assert.New(t)
 	e := NewFixedRateExtractor(map[string]map[string]float64{
-		"service1": {
-			"op1": 1,
+		"sERvice1": {
+			"OP1": 1,
 			"op2": 0.5,
 		},
 	})
@@ -39,14 +39,14 @@ func TestFixedCases(t *testing.T) {
 
 func TestAnalyzedExtractor(t *testing.T) {
 	config := make(map[string]map[string]float64)
-	config["servicea"] = make(map[string]float64)
-	config["servicea"]["opa"] = 0
+	config["serviceA"] = make(map[string]float64)
+	config["serviceA"]["opA"] = 0
 
-	config["serviceb"] = make(map[string]float64)
-	config["serviceb"]["opb"] = 0.5
+	config["serviceB"] = make(map[string]float64)
+	config["serviceB"]["opB"] = 0.5
 
-	config["servicec"] = make(map[string]float64)
-	config["servicec"]["opc"] = 1
+	config["serviceC"] = make(map[string]float64)
+	config["serviceC"]["opC"] = 1
 
 	tests := []extractorTestCase{
 		// Name: <priority>/(<no match reason>/<extraction rate>)

pkg/trace/event/extractor_legacy.go

@@ -15,11 +15,14 @@ type legacyExtractor struct {
 }
 
 // NewLegacyExtractor returns an APM event extractor that decides whether to extract APM events from spans following the
-// specified extraction rates for a span's service. The map keys must strictly be lower-cased.
+// specified extraction rates for a span's service.
 func NewLegacyExtractor(rateByService map[string]float64) Extractor {
-	return &legacyExtractor{
-		rateByService: rateByService,
+	// lower-case keys for case insensitive matching (see #3113)
+	rbs := make(map[string]float64, len(rateByService))
+	for k, v := range rateByService {
+		rbs[strings.ToLower(k)] = v
 	}
+	return &legacyExtractor{rateByService: rbs}
 }
 
 // Extract decides to extract an apm event from the provided span if there's an extraction rate configured for that

pkg/trace/event/extractor_legacy_test.go

@@ -10,7 +10,7 @@ import (
 
 func TestLegacyCases(t *testing.T) {
 	assert := assert.New(t)
-	e := NewLegacyExtractor(map[string]float64{"service1": 1})
+	e := NewLegacyExtractor(map[string]float64{"serviCE1": 1})
 	span := &pb.Span{Service: "SeRvIcE1"}
 	traceutil.SetTopLevel(span, true)