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When ddtrace (v4.x) or similar OpenTelemetry integrations set up an API-only TracerProvider before Langfuse initializes, Langfuse would fail with: AttributeError: 'TracerProvider' object has no attribute 'add_span_processor' This occurred because Langfuse assumed that any non-ProxyTracerProvider would be an SDK TracerProvider with the add_span_processor method. The fix updates _init_tracer_provider() to handle three scenarios: 1. No provider set (ProxyTracerProvider): Creates SDK provider and sets as global 2. SDK TracerProvider already set: Reuses the existing provider 3. Non-SDK TracerProvider (e.g., ddtrace): Creates a new SDK provider for Langfuse without overriding the global provider This allows Langfuse to work alongside ddtrace and other OpenTelemetry integrations that don't use the SDK TracerProvider. Addresses issue reported in GitHub discussions about ddtrace v4.x compatibility. Co-authored-by: jannik <jannik@langfuse.com>
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Improve OpenTelemetry TracerProvider initialization to be compatible with non-SDK providers like ddtrace v4.x.
Previously, if a non-SDK
TracerProvider(e.g., fromddtracev4.x) was globally set, Langfuse would fail due to the absence of theadd_span_processormethod. This change allows Langfuse to create and use its own SDKTracerProviderinternally without attempting to override the existing global provider, preventingAttributeErrorand "Overriding of current TracerProvider is not allowed" errors.