feat(react-native): Document standalone app start tracing and extend app start API#18635
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…app start API Adds a "Standalone App Start Tracing" section covering the experimental `enableStandaloneAppStartTracing` option, the dedicated `app.start` transaction, app-start sample rate via `tracesSampler`, and the `extendAppStart` / `getExtendedAppStartSpan` / `finishExtendedAppStart` extend API.
…dalone-app-start-docs
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antonis
commented
Jul 3, 2026
![sentry[bot]](https://avatars.githubusercontent.com/in/12637?s=60&v=4){kind=small}
Keeps the PR diff limited to the new Standalone App Start Tracing section (prettier had reformatted pre-existing code samples in the same file).
Metro doesn't support top-level await; wrap the async launch work in an async function so the example is copy-pasteable into an app entry file.
…dalone-app-start-docs
…8.18.0 Bumps the standalone tracing availability note to 8.17.2 (patch release) and removes the TODO now that the extend app start implementation is merged (ships in 8.18.0).
lucas-zimerman
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Jul 7, 2026
lucas-zimerman
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APIs match, docs looks good, LGTM! once the new version is relased
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DESCRIBE YOUR PR
Documents the React Native standalone app start feature and the extend app start API, under
tracing/instrumentation/automatic-instrumentation. Mirrors the structure/terminology of the existing Apple standalone app start docs.Adds a new "Standalone App Start Tracing" section covering:
_experiments.enableStandaloneAppStartTracingoption (available since RN SDK 8.17.2) and the dedicatedapp.starttransaction it emits (decoupled from navigation).tracesSamplerkeyed on the transaction name.extendAppStart/getExtendedAppStartSpan/finishExtendedAppStart) to include post-init work, with child-span breakdown and the 30s auto-finish deadline.Relates to getsentry/sentry-react-native#6017.
Note
The "Extending the App Launch" sub-section documents the extend API from getsentry/sentry-react-native#6392, which is merged and ships in RN SDK 8.18.0 (its alert is marked accordingly). The standalone-tracing portion is already available in 8.17.2.
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