Add OTLP trace ingestion MVP

[abidlabs]

• add a minimal OTLP/HTTP protobuf receiver at /otel/v1/traces
• route spans into Trackio projects/runs using trackio.project, trackio.run, service.name, or query params
• convert incoming OTel/OpenInference spans into existing trackio.Trace log entries so the current Traces tab can display them
• document exporter setup, including smolagents + OpenInference
• add runnable examples for a manual OTLP span and a smolagents/OpenInference agent run

V1 scope

This follows the MLflow/Weave pattern of supporting standard OTel ingestion instead of framework-specific integrations. V1 is traces-only, protobuf-only, and stores converted spans through the existing metrics/logs path. A dedicated spans table, gRPC receiver, richer trace tree UI, and additional semantic convention mappings can follow separately.

Tests

• python -m ruff check examples/otel-basic-mvp.py examples/otel-smolagents-integration.py trackio/otel.py trackio/server.py tests/unit/test_otel_ingest.py
• python -m pytest tests/unit/test_otel_ingest.py
• python -m pytest tests/unit/test_otel_ingest.py tests/unit/test_gradio_api_spaces.py tests/unit/test_sqlite_storage.py
• started a local Trackio Starlette/uvicorn server, ran examples/otel-basic-mvp.py and examples/otel-smolagents-integration.py against /otel/v1/traces, and confirmed SQLite stored 1 basic trace plus 3 smolagents spans (FinalAnswerTool, Step 1, CodeAgent.run)

[gradio-pr-bot]

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[gradio-pr-bot]

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This Pull Request includes changes to the following packages.

Package	Version
trackio	minor

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• Add OTLP trace ingestion MVP

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[HuggingFaceDocBuilderDev]

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Install Trackio from this PR (includes built frontend)

pip install "https://huggingface.co/buckets/trackio/trackio-wheels/resolve/027a28339d1bad36ebff6ad996dafef9919a9d66/trackio-0.25.1-py3-none-any.whl"

[HuggingFaceDocBuilderDev]

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