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JPeer264 merged 2 commits into from
Feb 4, 2026
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feat(cloudflare): Move known limitations to Cloudflare's quick start #16222

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feat(cloudflare): Move known limitations to Cloudflare's quick start
JPeer264 Jan 30, 2026
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Update docs/platforms/javascript/guides/cloudflare/index.mdx
JPeer264 Jan 30, 2026
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12 changes: 12 additions & 0 deletions docs/platforms/javascript/guides/cloudflare/index.mdx
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Expand Up @@ -18,6 +18,10 @@ Use this guide for general instructions on using the Sentry SDK with Cloudflare.
- **[Remix](/platforms/javascript/guides/cloudflare/frameworks/remix/)**
- **[SvelteKit](/platforms/javascript/guides/cloudflare/frameworks/sveltekit/)**

<Alert>
The Cloudflare Workers runtime has some platform-specific limitations that affect tracing. See [Known Limitations](#known-limitations) for details.
</Alert>

<PlatformContent includePath="getting-started-prerequisites" />

## Step 1: Install
Expand Down Expand Up @@ -208,6 +212,14 @@ Now, head over to your project on [Sentry.io](https://sentry.io) to view the col

<PlatformContent includePath="getting-started-verify-locate-data" />

## Known Limitations

### Span Durations

Server-side spans will display `0ms` for their durations. In the Cloudflare Workers runtime, `performance.now()` and `Date.now()` only advance after I/O occurs. CPU-bound operations will show zero duration. This is a security measure Cloudflare implements to [mitigate against timing attacks](https://developers.cloudflare.com/workers/runtime-apis/performance/).

This is expected behavior in the Cloudflare Workers environment and affects all frameworks deployed to Cloudflare Workers, including Next.js, Astro, Remix, and others.

## Next Steps

At this point, you should have integrated Sentry and should already be sending data to your Sentry project.
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6 changes: 1 addition & 5 deletions docs/platforms/javascript/guides/nextjs/best-practices/deploying-on-cloudflare.mdx
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Expand Up @@ -58,8 +58,4 @@ After adding these settings, build and deploy your Next.js application to Cloudf

## Known Limitations

### Server-Side Span Durations

Server-side spans will display `0ms` for their durations due to a security measure Cloudflare Workers implements to prevent timing attacks. This is expected behavior in the Cloudflare Workers environment.

For more information about this limitation, see the [Cloudflare Workers documentation on Performance APIs](https://developers.cloudflare.com/workers/runtime-apis/performance/).
When running on Cloudflare Workers, there are some platform-specific limitations to be aware of. See the [Cloudflare SDK Known Limitations](/platforms/javascript/guides/cloudflare/#known-limitations) for details.