add metrics for service

pkg/listener/dns/listener.go

@@ -9,6 +9,7 @@ import (
 	"net/http"
 	"strings"
 
+	"github.com/go-gost/gost/pkg/common/metrics"
 	"github.com/go-gost/gost/pkg/listener"
 	"github.com/go-gost/gost/pkg/logger"
 	md "github.com/go-gost/gost/pkg/metadata"
@@ -112,6 +113,7 @@ func (l *dnsListener) Accept() (conn net.Conn, err error) {
 	var ok bool
 	select {
 	case conn = <-l.cqueue:
+		conn = metrics.WrapConn(l.options.Service, conn)
 	case err, ok = <-l.errChan:
 		if !ok {
 			err = listener.ErrClosed