fixup for attrs

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

tracer.go

@@ -7,7 +7,6 @@ import (
 	"unicode/utf8"
 
 	"github.com/twmb/franz-go/pkg/kgo"
-	"go.opentelemetry.io/otel/attribute"
 	semconv "go.opentelemetry.io/otel/semconv/v1.18.0"
 	"go.unistack.org/micro/v3/tracer"
 )
@@ -61,7 +60,7 @@ func (m *hookTracer) OnFetchBatchRead(meta kgo.BrokerMetadata, topic string, _ i
 // hook.
 func (m *hookTracer) OnProduceRecordBuffered(r *kgo.Record) {
 	// Set up span options.
-	attrs := []attribute.KeyValue{
+	attrs := []interface{}{
 		semconv.MessagingSystemKey.String("kafka"),
 		semconv.MessagingDestinationKindTopic,
 		semconv.MessagingDestinationName(r.Topic),
@@ -72,7 +71,7 @@ func (m *hookTracer) OnProduceRecordBuffered(r *kgo.Record) {
 		attrs = append(attrs, semconv.MessagingKafkaClientIDKey.String(m.clientID))
 	}
 	opts := []tracer.SpanOption{
-		tracer.WithSpanLabels(otel2Micro(attrs...)),
+		tracer.WithSpanLabels(attrs...),
 		tracer.WithSpanKind(tracer.SpanKindProducer),
 	}
 	// Start the "publish" span.
@@ -111,7 +110,7 @@ func (m *hookTracer) OnProduceRecordUnbuffered(r *kgo.Record, err error) {
 // processing.
 func (m *hookTracer) OnFetchRecordBuffered(r *kgo.Record) {
 	// Set up the span options.
-	attrs := []attribute.KeyValue{
+	attrs := []interface{}{
 		semconv.MessagingSystemKey.String("kafka"),
 		semconv.MessagingSourceKindTopic,
 		semconv.MessagingSourceName(r.Topic),
@@ -126,7 +125,7 @@ func (m *hookTracer) OnFetchRecordBuffered(r *kgo.Record) {
 		attrs = append(attrs, semconv.MessagingKafkaConsumerGroupKey.String(m.group))
 	}
 	opts := []tracer.SpanOption{
-		tracer.WithSpanLabels(otel2Micro(attrs...)),
+		tracer.WithSpanLabels(attrs...),
 		tracer.WithSpanKind(tracer.SpanKindConsumer),
 	}
 
@@ -160,7 +159,7 @@ func (m *hookTracer) OnFetchRecordUnbuffered(r *kgo.Record, _ bool) {
 // iteration of your processing for the record.
 func (m *hookTracer) WithProcessSpan(r *kgo.Record) (context.Context, tracer.Span) {
 	// Set up the span options.
-	attrs := []attribute.KeyValue{
+	attrs := []interface{}{
 		semconv.MessagingSystemKey.String("kafka"),
 		semconv.MessagingSourceKindTopic,
 		semconv.MessagingSourceName(r.Topic),
@@ -176,7 +175,7 @@ func (m *hookTracer) WithProcessSpan(r *kgo.Record) (context.Context, tracer.Spa
 		attrs = append(attrs, semconv.MessagingKafkaConsumerGroupKey.String(m.group))
 	}
 	opts := []tracer.SpanOption{
-		tracer.WithSpanLabels(otel2Micro(attrs...)),
+		tracer.WithSpanLabels(attrs...),
 		tracer.WithSpanKind(tracer.SpanKindConsumer),
 	}
 
@@ -187,7 +186,7 @@ func (m *hookTracer) WithProcessSpan(r *kgo.Record) (context.Context, tracer.Spa
 	return m.tracer.Start(r.Context, r.Topic+" process", opts...)
 }
 
-func maybeKeyAttr(attrs []attribute.KeyValue, r *kgo.Record) []attribute.KeyValue {
+func maybeKeyAttr(attrs []interface{}, r *kgo.Record) []interface{} {
 	if r.Key == nil {
 		return attrs
 	}
@@ -198,11 +197,3 @@ func maybeKeyAttr(attrs []attribute.KeyValue, r *kgo.Record) []attribute.KeyValu
 	keykey = string(r.Key)
 	return append(attrs, semconv.MessagingKafkaMessageKeyKey.String(keykey))
 }
-
-func otel2Micro(attrs ...attribute.KeyValue) []interface{} {
-	ret := make([]interface{}, 0, len(attrs))
-	for _, a := range attrs {
-		ret = append(ret, a.Key, a.Value)
-	}
-	return ret
-}