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meta: Backfill v9 migration guide items #14459

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Nov 26, 2024
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meta: Backfill v9 migration guide items #14459

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meta: Backfill v9 migration guide items
lforst Nov 25, 2024
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Merge branch 'develop' into lforst-backfill-v9-migration-items
lforst Nov 26, 2024
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19 changes: 10 additions & 9 deletions docs/migration/draft-v9-migration-guide.md
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## General

- **Returning `null` from `beforeSendSpan` span is deprecated.**
- **Passing `undefined` to `tracesSampleRate` / `tracesSampler` / `enableTracing` will be handled differently in v9**

In v8, a setup like the following:
In v8, a setup like the following:

```ts
Sentry.init({
tracesSampleRate: undefined,
});
```
```ts
Sentry.init({
tracesSampleRate: undefined,
});
```

Will result in tracing being _enabled_, although no spans will be generated.
In v9, we will streamline this behavior so that passing `undefined` will result in tracing being disabled, the same as not passing the option at all.
If you are relying on `undefined` being passed in and having tracing enabled because of this, you should update your config to set e.g. `tracesSampleRate: 0` instead, which will also enable tracing in v9.
Will result in tracing being _enabled_, although no spans will be generated.
In v9, we will streamline this behavior so that passing `undefined` will result in tracing being disabled, the same as not passing the option at all.
If you are relying on `undefined` being passed in and having tracing enabled because of this, you should update your config to set e.g. `tracesSampleRate: 0` instead, which will also enable tracing in v9.

## `@sentry/utils`

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