@sentry/cloudflare: Durable Object RPC spans are not linked to Worker request traces

[camhahu]

Is there an existing issue for this?

• I have checked for existing issues https://github.com/getsentry/sentry-javascript/issues
• I have reviewed the documentation https://docs.sentry.io/
• I am using the latest SDK release https://github.com/getsentry/sentry-javascript/releases

How do you use Sentry?

Sentry Saas (sentry.io)

Which SDK are you using?

@sentry/cloudflare - hono

SDK Version

10.38.0

Framework Version

Hono 4.10.1, Wrangler 4.55.0

Link to Sentry event

https://enhance-labs.sentry.io/explore/traces/trace/d0a891c5ab8848c5acfd9c802c1f28af

Reproduction Example/SDK Setup

DO Sentry init:

export const MyDO = Sentry.instrumentDurableObjectWithSentry(
  (env: Env) => ({
    dsn: "...",
    tracesSampleRate: 1.0,
    enableLogs: true,
    environment: env.ENVIRONMENT,
    instrumentPrototypeMethods: true,
  }),
  MyDOBase,
);

Worker init options (which calls the DO):

{
    dsn: "...",
    sendDefaultPii: true,
    environment: env.ENVIRONMENT,
    tracesSampleRate: 1.0,
    enableLogs: true,
  }

Steps to Reproduce

1. Instrument the Worker with withSentry(...) and tracesSampleRate: 1.0.
2. Instrument the Durable Object with instrumentDurableObjectWithSentry(...), also with tracesSampleRate: 1.0 and instrumentPrototypeMethods: true.
3. Use the same DSN for both Worker and DO (same behaviour occurs with different DSNs though - using a different DSN in the DO is actually ignored and sends DO traces to the Worker DSN, possibly another bug but not what I'm trying to do so I am not concerned)
4. In Worker fetch, call a DO RPC method (e.g. stub.rpcPing()), then return a response.
5. Run locally (wrangler dev) and call the endpoint a few times
6. In Sentry Traces, inspect:
   • the Worker HTTP transaction/span (http.server won't have child spans for the DO RPC call)
   • the DO RPC spans will all be in a single trace for that DO (for DO lifecycle I assume) (op=rpc)

Expected Result

I would expect RPC methods to behave like DO.fetch in that the worker trace and baggage is propagated/they appear as child spans

Actual Result

Here's a trace for lots of server requests that had DO calls: https://enhance-labs.sentry.io/explore/traces/trace/ce631a8e51d74ba7b5398198b5c92778

Here's the trace where those DO calls ended up: https://enhance-labs.sentry.io/explore/traces/trace/d0a891c5ab8848c5acfd9c802c1f28af/

Additional Context

No response

Priority

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[linear]

JS-1715

[JPeer264]

Thanks for writing in. It very much looks like that this is not yet working: #16898

I'll try to prioritize RPCs within Cloudflare

[camhahu]

Thanks @JPeer264 !

Linked issue seems to be able Service Bindings. Feels like these things are probably similar but just want to be clean Sentry does have RPC instrumentation today for Durable Objects today - just no trace propagation

[JPeer264]

Makes sense. Maybe we missed something when we implemented trace propagation