@sentry/cloudflare: Durable Object RPC methods drop metrics, logs and errors unless the caller propagates a trace

从 createRpcPrototypeWrapper 开始，将其缺少 metadata 的路径与 instrumentWorkerEntrypoint 的 capture-only wrapper 和 wrapMethodWithSentry 进行比较。复现 issue 中 plain worker 发起的外部 RPC 调用，然后验证不带 metadata 的调用会使用 client 和 isolation scope 运行，flush metrics 和 errors，并让内部的 this.method() 调用保持未包装状态。

Environment

• @sentry/cloudflare: 10.74.0 (same logic on develop / 11.0.0-beta.2)
• DO wrapped with instrumentDurableObjectWithSentry, enableRpcTracePropagation: true (the only
  supported way to instrument RPC methods in v11, now that instrumentPrototypeMethods is removed)

Description

createRpcPrototypeWrapper only calls wrapMethodWithSentry when the last argument carries
__sentry_rpc_meta__. Otherwise the original method runs with no client bound. Then:

• Sentry.metrics.count/gauge/distribution return early (no client);
• Sentry.captureException and Sentry.logger.* are dropped;
• no rpc span is recorded, and a thrown error is not captured.

Callers send the metadata only if they are Sentry-instrumented, have an active trace, and got the stub
through get/getByName on the instrumented env (see #24442). Common cases that lose everything:

• calls from uninstrumented workers or mixed deployments;
• calls from code running outside the request's async context;
• any call through jurisdiction().

WorkerEntrypoint already covers this case: instrumentWorkerEntrypoint uses a capture-only wrapper
when the metadata is missing. Durable Objects have no equivalent. fetch, alarm and webSocket* are
always wrapped, so only RPC is affected. That makes the gap easy to miss: our production data had
14 days of DO alarm spans and zero DO rpc spans.

Reproduction

class MyDO extends DurableObject {
  async ping() {
    Sentry.metrics.count('my_do.ping', 1);
    throw new Error('boom');
  }
}
export const MyDOInstrumented = Sentry.instrumentDurableObjectWithSentry(
  env => ({ dsn: env.SENTRY_DSN, tracesSampleRate: 1, enableRpcTracePropagation: true }),
  MyDO,
);
// From a plain (uninstrumented) worker:
await env.MY_DO.get(env.MY_DO.idFromName('x')).ping();

Neither the metric nor the error reaches Sentry.

Expected

External RPC calls without metadata still run inside a client and isolation scope with flush, as
WorkerEntrypoint does. Internal this.method() calls stay unwrapped.

Proposed fix

A PR with this change will follow.