Tracing, Prometheus metrics, and structured logs with two decorators: Fitz vs the OpenTelemetry setup in FastAPI

For full observability in FastAPI you need 6 pip packages + 60 lines of config + manual glue between logs/spans/metrics. In Fitz it's two decorators and an env var. With trace_id auto-correlated between logs and spans, and Secret redacted in logs without thinking. Your app grows. The client wants to

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