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docs(bun): Document the build plugin in the instrumentation step - #19361

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docs(bun): Document the build plugin in the instrumentation step#19361
JPeer264 wants to merge 1 commit into
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janpeer/sdk-1501-bun-getting-started-manual-setup

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DESCRIBE YOUR PR

The guide told users to run bun --preload ./instrument.js app.js and then warned that auto-instrumentation doesn't work with bundled code, which is backwards: library and framework spans exist only in a build, and @sentry/bun/plugin was never named on the page.

The two compose. --preload guarantees init order and is always needed; the plugin build adds library and framework spans on top. Verified in the runtime audit repro quickstarts/bun variant (c): a sentryBunPlugin() bundle run with --preload produced errors, route-named Bun.serve spans, http.client spans carrying sentry-trace and baggage, and logs.

  • Add an optional "Build With the Sentry Plugin" step using sentryBunPlugin, before the run step
  • Reframe the --preload step as what guarantees init order, and show it for both source and built output
  • Drop the "Bundled Code Limitation" alert, which claimed the opposite
  • Add a troubleshooting entry for an instrumented package left outside the bundle, which is what silences library spans in a plugin build
  • Add logs to the onboarding options, so the logs verify block already on the page can be selected

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  • Please give the docs team up to 1 week to review your PR unless you've supplied a deadline.

Thanks in advance for your help!

PRE-MERGE CHECKLIST

Make sure you've checked the following before merging your changes:

  • Checked Vercel preview for correctness, including links
  • PR was reviewed and approved by any necessary SMEs (subject matter experts)
  • PR was reviewed and approved by a member of the Sentry docs team

LEGAL BOILERPLATE

Look, I get it. The entity doing business as "Sentry" was incorporated in the State of Delaware in 2015 as Functional Software, Inc. and is gonna need some rights from me in order to utilize my contributions in this here PR. So here's the deal: I retain all rights, title and interest in and to my contributions, and by keeping this boilerplate intact I confirm that Sentry can use, modify, copy, and redistribute my contributions, under Sentry's choice of terms.

EXTRA RESOURCES

The guide told users to run `bun --preload ./instrument.js app.js` and then
warned that auto-instrumentation doesn't work with bundled code, which is
backwards: library and framework spans exist only in a build, and
`@sentry/bun/plugin` was never named on the page.

The two compose. `--preload` guarantees init order and is always needed; the
plugin build adds library and framework spans on top. Verified in the runtime
audit repro `quickstarts/bun` variant (c): a `sentryBunPlugin()` bundle run
with `--preload` produced errors, route-named `Bun.serve` spans, `http.client`
spans carrying `sentry-trace` and `baggage`, and logs.

- Add an optional "Build With the Sentry Plugin" step using `sentryBunPlugin`,
  before the run step
- Reframe the `--preload` step as what guarantees init order, and show it for
  both source and built output
- Drop the "Bundled Code Limitation" alert, which claimed the opposite
- Add a troubleshooting entry for an instrumented package left outside the
  bundle, which is what silences library spans in a plugin build
- Add `logs` to the onboarding options, so the logs verify block already on
  the page can be selected

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
@JPeer264
JPeer264 requested review from chargome and isaacs September 11, 2026 07:24
@JPeer264 JPeer264 self-assigned this Sep 11, 2026
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linear-code Bot commented Sep 11, 2026

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SDK-1501

@github-actions github-actions Bot added the Priority: Needs Triage The PR description is missing valid priority information label Sep 11, 2026
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