tracer token

• 跟踪令牌

tracer token的用法和样例：

例句

1. Name of the Subscriber that received the tracer token.
   接收跟踪令牌的订阅服务器的名称。
2. Returns one row for each tracer token that has been inserted into a publication to determine latency.
   为每个已插入发布中用于确定滞后时间的跟踪令牌返回一行。