如何让brpc的brpcz只展示发生错误的请求？

线上服务，brpc请求很多。使用brpcz页面看到的都是ok，使用：

```
curl localhost:port/rpcz?error_code=1014
```
会显示 **Fail to find matched spans`**，但是确实是有这个错误的请求，请问如何解决？

Reproduce the brpcz page behavior with curl localhost:port/rpcz?error_code=1014 and compare it with requests known to have error 1014. Trace how the rpcz endpoint matches recorded spans; done means explaining or correcting why the filter reports “Fail to find matched spans” despite failed requests, with a regression check for the filter behavior.

Written by the indexing model from the issue text.