### Checklist - [x] I have searched the [existing issues](https://github.com/oracle/ai-optimizer/issues) for similar feature requests. - [x] I added a descriptive title and summary to this issue. ### Summary Design observability features to track system performance and cost metrics: - [ ] Monitor token usage, API calls, and response times. - [ ] Trace tool usage and LangGraph execution paths. - [ ] Display cost per query (integrate with LiteLLM). - [ ] Develop dashboards for system metrics and analytics. ### Why? _No response_ ### How? _No response_ ### Additional Context _No response_