[Feature]: Request/usage by api key

[87435]

Use Case

It would be extremely useful to see requests and usage by (CPA) api key. I have many tools/projects/harnesses using separate CPA keys to access CPA models, and I am interested in monitoring usage and failure rate by tool.

Current Pain Point

Request monitoring allows grouping by Account (=upstream, LLM provider account), Provider, Model, Channel Status... but no usage by CPA user/api key.

Expected Solution

Allow grouping and graphs by CPA api key

Priority

{"Medium" => "clearly improves usability"}

Additional Context

No response

Checklist

• I have searched existing Issues and did not find a duplicate request.