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#722 这个 pr 导致 InitLogger 无法工作,原因是 init 创建了一个 logger 导致 InitLogger 中的 if logger != nil 永远是 true,见 #747
碰巧 init 中创建的 logger 是 debug 级别,会在线上输出大量日志,更新后日志相关成本激增
改用 sync.Once 保证只创建一次,在 InitLogger 不失效的同时,满足 #722 老哥大量创建和销毁客户端的奇怪需求