diff --git a/cmd/metrics/parser.go b/cmd/metrics/parser.go
index 019cfcf..42566a4 100644
--- a/cmd/metrics/parser.go
+++ b/cmd/metrics/parser.go
@@ -58,6 +58,7 @@ var MetricCmd = &cobra.Command{
 		log.Debugf("start to parse metrics line by line\n")
 
 		var rx []*metrics.MetricMatcher
+
 		scanner := bufio.NewScanner(r)
 		for scanner.Scan() {
 			line := scanner.Text()
diff --git a/pkg/metrics/parser.go b/pkg/metrics/parser.go
index 35ab005..11a1340 100644
--- a/pkg/metrics/parser.go
+++ b/pkg/metrics/parser.go
@@ -150,9 +150,13 @@ func init() {
 }
 
 func (mt *MetricMatcher) CopyData() *MetricMatcher {
+	var newLabel []Label
+	for _, label := range mt.Labels {
+		newLabel = append(newLabel, label)
+	}
 	return &MetricMatcher{
-		Name:   mt.Name,
-		Header: mt.Header,
-		Labels: mt.Labels,
+		Name:   strings.Clone(mt.Name),
+		Header: strings.Clone(mt.Header),
+		Labels: newLabel,
 	}
 }
diff --git a/pkg/metrics/resource.go b/pkg/metrics/resource.go
index 8ad0982..2c112b8 100644
--- a/pkg/metrics/resource.go
+++ b/pkg/metrics/resource.go
@@ -4,9 +4,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"os"
-
-	log "github.com/sirupsen/logrus"
 )
 
 type Resource struct {
@@ -45,20 +42,9 @@ func (r *Resource) JSON() string {
 }
 
 func (rl *ResourceList) Print(writer ...io.Writer) {
-	var W io.Writer
-	if len(writer) == 0 {
-		W = os.Stdout
-	} else {
-		w := io.MultiWriter(writer...)
-		W = io.MultiWriter(os.Stdout, w)
-	}
+	var w io.Writer = io.MultiWriter(writer...)
 	for _, r := range *rl {
-		data, err := json.Marshal(r.JSON())
-		if err != nil {
-			log.Error(err)
-			return
-		}
-		_, _ = fmt.Fprintf(W, "%v\n", string(data))
+		_, _ = fmt.Fprintf(w, "%v\n", r.JSON())
 	}
 }