change to prometheus

cmd/cart/otel.go

@@ -7,8 +7,8 @@ import (
 
 	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc"
-	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc"
 	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
+	"go.opentelemetry.io/otel/exporters/prometheus"
 	"go.opentelemetry.io/otel/log/global"
 	"go.opentelemetry.io/otel/propagation"
 	"go.opentelemetry.io/otel/sdk/log"
@@ -95,7 +95,7 @@ func newTracerProvider() (*trace.TracerProvider, error) {
 }
 
 func newMeterProvider() (*metric.MeterProvider, error) {
-	metricExporter, err := otlpmetricgrpc.New(context.Background())
+	metricExporter, err := prometheus.New()
 	if err != nil {
 		return nil, err
 	}