Next.JS Tracing on Edge Runtime with @vercel/otel

Next.js is a powerful web framework that integrates frontend and backend code, enhancing performance and supporting complex content by centralizing and efficiently distributing tasks between browsers and servers. It can be compiled into Node.js for single or scalable architecture execution, like AWS Lambda, and is compatible with various runtimes, including the Vercel Edge runtime known for quick start times and cost efficiency. OpenTelemetry, an open-source observability tool, is instrumental in gathering traces to understand software performance, especially in debugging scenarios where tracing provides insights into code execution times. The Vercel Edge runtime's limitations with standard Node APIs necessitate configuring the OpenTelemetry SDK to export traces, and using the @vercel/otel package simplifies this process by bundling compatible OpenTelemetry packages for different runtimes. Additionally, trace propagation from browsers is crucial for maintaining trace context across services, often implemented by injecting trace IDs into HTTP headers. Highlight.io, an observability platform, leverages OpenTelemetry to visualize spans from various runtimes, aiding developers in identifying performance issues and understanding application behavior under different conditions.

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