Next 15 stabilizes instrumentation.ts, onRequestError, and makes register() run on both Node and Edge.
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instrumentation.ts — what changed for observability in Next 15?
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instrumentationobservability
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instrumentation.ts register() runs once on server start to init OTEL/Sentry; Next 15 adds onRequestError hook and Edge support via instrumentation-client.ts.
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Dossier 45 of 95 decoded in the Next.js track. One more won't hurt.