### Check for existing issues

- [x] I have searched the existing issues and checked that my issue is not a duplicate.

### What happened?

I set liteLLM global_max_parallel_requests

<img width="1324" height="185" alt="Image" src="https://github.com/user-attachments/assets/23d27165-3b79-46c9-8c02-47d47ad7cc94" />

It is hoped that the number of requests can be limited to maintain server stability.

but in fact，it has no use to protect my server， there still has too many requests

<img width="1676" height="47" alt="Image" src="https://github.com/user-attachments/assets/15106f37-2ee4-4a69-8b06-b3336f0c6f65" />

### Steps to Reproduce

1. set global_max_parallel_requests 2. just request llm 3. The number of concurrent requests can still exceed the limit.

### Relevant log output

```shell

```

### What part of LiteLLM is this about?

Proxy

### What LiteLLM version are you on ?

1.82.6

### Twitter / LinkedIn details

_No response_