Instrument Cloudflare Worker RPC methods

[timfish]

Description

Currently our withSentry function only instruments known methods on the handler like fetch, schedule etc.

Like for Durable Objects, Cloudflare lets you add other methods to your exported object which are exposed as RPC endpoints which can be called from other workers:
https://developers.cloudflare.com/workers/runtime-apis/rpc/

We already do this for durable objects so we should do instrument these for workers too!

[Mael-Abgrall]

I was looking for this too, found there's another issue here #15942

[chargome]

closed by #17424 if I'm not mistaken, please re-open otherwise!

[Mael-Abgrall]

I don't think so

for example in my case I was looking to add Sentry on service bindings.

Historically you had to call them on fetch, but the newer api let you access directly the methods

in the code example here: https://developers.cloudflare.com/workers/runtime-apis/bindings/service-bindings/#example--build-your-first-service-binding-using-rpc
Sentry on the workerB is not running when calling const result = await env.WORKER_B.add(1, 2);.

If I'm mistaken, and Sentry can be initialized when calling the add method, then the doc in Sentry is missing this bit :)