message: fix: add hasOwnProperty check
diff: @@ -176,8 +176,10 @@ export class MetricName {
  let tagsArr = [];
  for(let key in this.tags) {
  + if(this.tags.hasOwnProperty(key)) {
  tagsArr.push(key + MetricName.TAGS_CONCAT + this.tags[key]);
  }
  + }
  tagsArr.sort();
  return [this.key, tagsArr.join(MetricName.TAGS_JOIN), this.level].join(MetricName.NAME_JOIN);
  