Using @vercel/otel + instrumentation.ts to trace Server Components, fetch, and middleware.
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Observability with OpenTelemetry in Next 15 — how is OTEL wired?
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opentelemetryinstrumentation
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Install @vercel/otel, call registerOTel in instrumentation.ts register(), and set experimental.instrumentationHook: true — Next auto-traces RSC render, fetch, and middleware.
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