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Learn how to instrument your Rails application with OpenTelemetry in this comprehensive conference talk from RailsConf 2025. Discover the fundamentals of observability and explore the benefits of OpenTelemetry's three core signals: Traces, Metrics, and Logs. Understand how Active Support Notifications work and how OpenTelemetry leverages them for automatic instrumentation, along with instrumentation strategies used in other popular Rails-related libraries. Follow along as the speaker, an OpenTelemetry maintainer, demonstrates configuring the OpenTelemetry SDK in a minimal Rails application, adding custom instrumentation to core application methods, and exporting results to an observability backend for monitoring and analysis.
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