feat(closes OPEN-8244): Adds Gemini API client tracing

[viniciusdsmello]

Pull Request

Summary

This PR introduces a native trace_gemini integration to the Openlayer Python SDK, enabling automatic tracing of Google Gemini API calls.

Changes

• Added src/openlayer/lib/integrations/gemini_tracer.py for comprehensive Gemini API tracing (streaming, non-streaming, async, token counting, function calling, latency, time-to-first-token).
• Updated src/openlayer/lib/integrations/__init__.py to export trace_gemini.
• Updated src/openlayer/lib/__init__.py to expose trace_gemini and include client validation.
• Created examples/tracing/google-gemini/gemini_tracing.ipynb with concise usage examples for non-streaming, streaming, multi-turn, and configured generations.

Context

This integration resolves OPEN-8244 by providing native support for tracing Google Gemini API calls, aligning with existing integrations like trace_openai. This unblocks enterprise customers who prefer direct google.generativeai client usage over LangChain for their tracing, logging, and evaluation workflows.

Testing

• Unit tests
• Manual testing (verified functionality with the provided Jupyter notebook)
• Postman CI/CD
• Other (Jupyter notebook examples serve as functional tests)

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Linear Issue: OPEN-8244

 

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