Discussion on "Observability in the Next.js App Router: Field Notes on instrumentation.ts, onRequestError, and the Trace That Leaked Across Requests d7bf86"

Ahmed Mahmoud · 2026-08-31T06:06:48.421Z

Headline: Next.js's instrumentation.ts file and its onRequestError hook give the App Router real distributed tracing and centralized error reporting, but Vercel Fluid Compute reusing one warm instance

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Observability in the Next.js App Router: Field Notes on instrumentation.ts, onRequestError, and the Trace That Leaked Across Requests d7bf86

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