How to send .NET 10 telemetry to Pydantic Logfire using OpenTelemetry

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Developers can integrate .NET 10 applications with Pydantic Logfire, an observability platform typically associated with Python, by using the open OpenTelemetry standard rather than a custom integration. The .NET app sends traces, metrics, and logs via the OTLP protocol, which Logfire natively accepts and displays on its dashboard. The implementation requires adding a few NuGet packages, including the OTLP exporter and ASP.NET Core instrumentation, to a standard .NET 10 Web API project. A Logfire write token, generated from the platform's project settings, is used to authenticate telemetry and should be stored as an environment variable rather than hardcoded. This approach keeps the setup simple and also allows the same application to forward telemetry to any other OpenTelemetry-compatible backend in the future.

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