内置服务是否可以观测 streaming rpc

**Is your feature request related to a problem? (你需要的功能是否与某个问题有关?)**
我在实验 streaming rpc 的过程当中发现仿佛内置服务无法监控通过streamwrite发送的请求？或者说也许我找错了地方 请指教

**Describe the solution you'd like (描述你期望的解决方法)**

**Describe alternatives you've considered (描述你想到的折衷方案)**

**Additional context/screenshots (更多上下文/截图)**

Start by locating the built-in services that expose request monitoring and trace how streaming RPC traffic sent through StreamWrite is handled. Confirm whether those services record or expose streaming requests, then document the gap and define observable behavior for a complete solution; the issue names no files or tests.

Written by the indexing model from the issue text.