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Add local Request Insights span tracing - #96275

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timneutkens merged 1 commit into
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codex/request-insights-local-span-recorder
Jul 28, 2026
Merged

Add local Request Insights span tracing#96275
timneutkens merged 1 commit into
canaryfrom
codex/request-insights-local-span-recorder

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@DavidIlie

@DavidIlie DavidIlie commented Jul 27, 2026 •
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Summary

  • Adds a local traceLocalSpan primitive for Request Insights diagnostics.
  • Supports detached roots and nested local parentage.
  • Records thrown errors, marks span status, rethrows, and always ends the span.
  • Keeps this foundational behavior separate from tracer/OTel integration.

Verification

pnpm build-all
pnpm --filter=next types
pnpm --filter=next build
pnpm test-unit --runTestsByPath packages/next/src/server/lib/trace/local-span-recorder.test.ts

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Stats from current PR

🔴 1 regression

Metric Canary PR Change Trend
Webpack Build Time 24.799s 25.318s 🔴 +519ms (+2%) ▁▁▄▃▂
📊 All Metrics
📖 Metrics Glossary

Dev Server Metrics:

  • Listen = TCP port starts accepting connections
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  • Cold = Fresh build (no cache)
  • Warm = With cached build artifacts

Build Metrics:

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  • Cached = With existing .next directory

Change Thresholds:

  • Time: Changes < 50ms AND < 10%, OR < 2% are insignificant
  • Size: Changes < 1KB AND < 1% are insignificant
  • All other changes are flagged to catch regressions

⚡ Dev Server

Metric Canary PR Change Trend
Cold (Listen) 813ms 814ms ✓ ██▁▁█
Cold (Ready in log) 811ms 819ms ✓ ▄▄▃▂▃
Cold (First Request) 1.374s 1.378s ✓ ▂▃▂▂▂
Warm (Listen) 814ms 813ms ✓ ███▁█
Warm (Ready in log) 810ms 815ms ✓ ▃▄▃▃▅
Warm (First Request) 1.381s 1.400s ✓ ▂▃▁▇▃
📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric Canary PR Change Trend
Cold (Listen) 814ms 812ms ✓ █▁█▁█
Cold (Ready in log) 817ms 788ms ✓ ▃▁▄▁▂
Cold (First Request) 3.580s 3.491s ✓ ▃▁▃▄▃
Warm (Listen) 814ms 813ms ✓ █▁███
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Warm (First Request) 3.528s 3.573s ✓ ▃▁▁▃▁

⚡ Production Builds

Metric Canary PR Change Trend
Fresh Build 5.758s 5.740s ✓ ▂▂▂▂▄
Cached Build 5.923s 5.998s ✓ ▂▅▂▁▂
📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric Canary PR Change Trend
Fresh Build 24.799s 25.318s 🔴 +519ms (+2%) ▁▁▄▃▂
Cached Build 25.497s 25.247s ✓ ▄▁▄▄▂
node_modules Size 549 MB 549 MB ✓ ▁▁▁▁▁
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📝 Changed Files (6 files)

Files with changes:

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📎 Tarball URL 
https://vercel-packages.vercel.app/next/commits/d4605672d0d26fae57cc39d0ffdbe08dbde8e3f4/next

Commit: d460567

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Tests Passed

Commit: d460567

@DavidIlie
DavidIlie force-pushed the codex/request-insights-local-span-recorder branch from 3e61c6d to b7ea3f7 Compare July 27, 2026 22:03
@DavidIlie
DavidIlie marked this pull request as ready for review July 27, 2026 22:05
Base automatically changed from codex/request-insights-safe-clock-bookkeeping to canary July 27, 2026 22:58
@DavidIlie
DavidIlie force-pushed the codex/request-insights-local-span-recorder branch from b7ea3f7 to d460567 Compare July 27, 2026 23:20
@timneutkens
timneutkens merged commit bc85662 into canary Jul 28, 2026
137 of 149 checks passed
@timneutkens
timneutkens deleted the codex/request-insights-local-span-recorder branch July 28, 2026 18:15
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