[hw-7] add metrics, tracing

loms/internal/infra/messaging/kafka/producer.go

@@ -8,6 +8,7 @@ import (
 	"time"
 
 	"route256/loms/internal/domain/entity"
+	"route256/loms/internal/infra/tracing"
 
 	"github.com/IBM/sarama"
 	"github.com/rs/zerolog/log"
@@ -64,6 +65,9 @@ func (p *statusProducer) runCallbacks() {
 }
 
 func (p *statusProducer) Send(ctx context.Context, id entity.ID, status string) error {
+	ctx, span := tracing.Tracer().Start(ctx, "Producer.Send")
+	defer span.End()
+
 	log.Debug().Msgf("sending event for id: %d; status: %s", id, status)
 
 	newStatus, err := mapOrderStatus(status)
@@ -86,6 +90,9 @@ func (p *statusProducer) Send(ctx context.Context, id entity.ID, status string)
 }
 
 func (p *statusProducer) SendRaw(ctx context.Context, id entity.ID, value []byte) error {
+	ctx, span := tracing.Tracer().Start(ctx, "Producer.SendRaw")
+	defer span.End()
+
 	if len(value) == 0 {
 		return fmt.Errorf("empty message value")
 	}