mirror of
https://github.com/hanzoai/next.js.git
synced 2026-09-24 17:00:51 +00:00
Jiwon ChoiandGitHub
fa71595a5e
> [!TIP] > Best reviewed with hide whitespace. ### Why? Cache Components prerenders can fail when an OpenTelemetry tracer is acquired before provider registration and later resolves through proxy tracer delegation: ``` Next.js encountered the unstable value `Math.random()` while prerendering ``` Current behavior: https://github.com/vercel/next.js/actions/runs/28518518762/job/84536475151?pr=95317#step:32:343 ### How? Patch proxy tracer delegation to apply the same Cache Components span instrumentation used for normal tracer lookup. Closes https://github.com/vercel/next.js/issues/94753 <!-- NEXT_JS_LLM_PR -->
28 lines
965 B
TypeScript
28 lines
965 B
TypeScript
import { trace, type Tracer } from '@opentelemetry/api'
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import { NodeSDK } from '@opentelemetry/sdk-node'
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import { OTLPTraceExporter } from '@opentelemetry/exporter-trace-otlp-http'
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import { HttpInstrumentation } from '@opentelemetry/instrumentation-http'
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import { ExpressInstrumentation } from '@opentelemetry/instrumentation-express'
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type TestGlobal = typeof globalThis & {
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__nextTestEarlyTracer?: Tracer
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}
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// Acquire this before sdk.start() to reproduce how instrumentation libraries
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// receive a ProxyTracer before the real provider is registered.
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;(globalThis as TestGlobal).__nextTestEarlyTracer ??= trace.getTracer(
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'next-test-early-tracer'
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)
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const sdk = new NodeSDK({
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serviceName: 'nextjs-otel-app',
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traceExporter: new OTLPTraceExporter({
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url:
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process.env.OTEL_EXPORTER_OTLP_TRACES_ENDPOINT ||
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'http://localhost:4318/v1/traces',
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}),
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instrumentations: [new HttpInstrumentation(), new ExpressInstrumentation()],
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})
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sdk.start()
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