From 19617c1ad9775e23ee56749c4a3620a3e6f6d207 Mon Sep 17 00:00:00 2001
From: GuangWong <guangwong@gmail.com>
Date: Tue, 11 Dec 2018 17:35:01 +0800
Subject: [PATCH] fix: add hasOwnProperty check

---
 packages/metrics/src/common/MetricName.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/packages/metrics/src/common/MetricName.ts b/packages/metrics/src/common/MetricName.ts
index eee3852b..86463e63 100644
--- a/packages/metrics/src/common/MetricName.ts
+++ b/packages/metrics/src/common/MetricName.ts
@@ -176,7 +176,9 @@ export class MetricName {
     let tagsArr = [];
 
     for(let key in this.tags) {
-      tagsArr.push(key + MetricName.TAGS_CONCAT + this.tags[key]);
+      if(this.tags.hasOwnProperty(key)) {
+          tagsArr.push(key + MetricName.TAGS_CONCAT + this.tags[key]);
+      }
     }
 
     tagsArr.sort();