How to integrate Remix, Sentry, and Cloudflare Workers (incl. tracing)

The code above is just a sample—I have adapted it from a production codebase and I can't guarantee it will work as-is. It's just here to illustrate what a solution should look like.

The main things you need to do to get everything hooked up are:

1. Rewrite instrumentBuild to accept a passed-through Hub instance, rather than using getCurrentHub() (including, perniciously, in helper functions such as hasTracingEnabled())
2. In server/index.ts, create a root transaction from the current route’s name and wrap the loaders and actions in spans via instrumentBuild.
3. In root.tsx, pass through your tracing & baggage into the meta function.
4. In root.tsx, include the current domain in tracePropagationTargets (because Remix fetchers will fetch from the entire URL rather than / root, which will confuse Sentry)
5. (Remix v2) In root.tsx, create an ErrorBoundary component (with the v2_errorBoundary flag set if you're