lmin

Results 2 issues of lmin

### Description Basically, you can't get the real value you really need

**Describe the bug (描述bug)** channel复用,init一次,使用http:// ,rr算法,pooled连接池方式,流量比较大的时候,就会产生大量的[E112]Fail to select server from http://xxx.com,但是服务是正常的,正确和错误的请求一直都在,有点像pooled的线程被占满后,其他请求都直接报错? **To Reproduce (复现方法)** **Expected behavior (期望行为)** **Versions (各种版本)** OS: Compiler: brpc: protobuf: **Additional context/screenshots (更多上下文/截图)**

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