7.3 OPEA Services OTel Tracing (Dataprep + Reranker)

Sprint Key: 7-3-opea-services-otel-tracing-dataprep-reranker Epic: 7 PRD: testing-framework

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Story 7.3: OPEA Services OTel Tracing (Dataprep + Reranker)

Status: ready-for-dev

Story

As a developer, I want the Dataprep and Reranker FastAPI services instrumented with OpenTelemetry, so that document ingestion and result reranking are visible in distributed traces.

Acceptance Criteria

1. AC1: OTel SDK dependencies installed in Dataprep and Reranker Dockerfiles
2. AC2: Dataprep service instrumented with service.name = "genieai-dataprep"
3. AC3: Reranker service instrumented with service.name = "genieai-reranker"
4. AC4: Dataprep-specific span attributes: dataprep.file_type, dataprep.chunk_count, dataprep.file_size_bytes
5. AC5: Reranker-specific span attributes: reranker.top_k, reranker.score_threshold, reranker.model_id, reranker.strategy
6. AC6: Trace context propagation on inter-service calls
7. AC7: Configurable OTLP endpoint via OTEL_EXPORTER_OTLP_ENDPOINT
8. AC8: Bootstrap-safe (graceful degradation if collector unavailable)
9. AC9: PII protection (no file content or document text in spans)
10. AC10: No API contract changes
11. AC11: Ruff passes on all modified code
12. AC12: Docker builds succeed
13. AC13: Existing tests pass