### What happened?

Hello, I am desperately trying to retrieve the x-openwebui-user-email and x-openwebui-user-id as indicated in the documentation here: https://docs.litellm.ai/docs/tutorials/openweb_ui#32-tracking-usage--spend

I thought it was OpenWebUI that wasn't passing the values, but in fact it is, since we can see them in the extra tags.

Here is my config.yaml file ``` litellm_settings: extra_spend_tag_headers: - “x-openwebui-user-id” - “x-openwebui-user-email” - “x-openwebui-user-role”

general_settings: user_header_mappings: - header_name: x-openwebui-user-id litellm_user_role: internal_user - header_name: x-openwebui-user-email litellm_user_role: customer ```

I think there is a bug since I configured it as described in the documentation.

Quick question: does the user have to exist in LiteLLM's internal users for the mapping to work?

Thank you

### Relevant log output

```shell lite-llm | 08:40:16 - LiteLLM Proxy:DEBUG: proxy_server.py:2893 - param_name=general_settings, param_value={'user_header_mappings': [{'header_name': 'x-openwebui-user-id', 'litellm_user_role': 'internal_user'}, {'header_name': 'x-openwebui-user-e…