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Automatic OpenTelemetry exporter setup is now opt-in. If you rely on FastAPI to configure exporters from OTEL_* environment variables, set FASTAPI_OTEL_AUTO_CONFIGURE=true or use FastAPI(telemetry={"auto_configure": True}) to retain the previous behavior.

Applications that configure their own providers and exporters require no changes. FastAPI Cloud enables automatic setup for you.

Breaking Changes

  • 💥 Require opt-in for automatic OpenTelemetry exporter setup. PR #16476 by @tiangolo.
Source: README.md, updated 2026-10-08