add opentracing spans for metrics

vendor/github.com/rcrowley/go-metrics/json_test.go

@@ -0,0 +1,28 @@
+package metrics
+
+import (
+	"bytes"
+	"encoding/json"
+	"testing"
+)
+
+func TestRegistryMarshallJSON(t *testing.T) {
+	b := &bytes.Buffer{}
+	enc := json.NewEncoder(b)
+	r := NewRegistry()
+	r.Register("counter", NewCounter())
+	enc.Encode(r)
+	if s := b.String(); "{\"counter\":{\"count\":0}}\n" != s {
+		t.Fatalf(s)
+	}
+}
+
+func TestRegistryWriteJSONOnce(t *testing.T) {
+	r := NewRegistry()
+	r.Register("counter", NewCounter())
+	b := &bytes.Buffer{}
+	WriteJSONOnce(r, b)
+	if s := b.String(); s != "{\"counter\":{\"count\":0}}\n" {
+		t.Fail()
+	}
+}