Drop platform resets reported by the Durable Object instrumentation

[RhysSullivan]

Problem

Every deploy files a small burst of error reports that mean nothing. The Cloudflare runtime resets every live Durable Object when a new script rolls out, and the Sentry DO instrumentation (instrumentDurableObjectWithSentry) captures that reset from inside the object being torn down, with mechanism auto.faas.cloudflare.durable_object and the runtime's message "Durable Object reset because its code was updated."

The capture-owner scheme cannot reach these. It drops the instrumentation's echo only when a worker seam classified the failure, answered the client and claimed the cause — and inside a dying object there is no seam and no request to claim it. The client-facing half is already handled: the in-flight request fails at the worker seam and is rendered there as a retryable 503.

Fix

The cloud beforeSend now drops an event when both hold:

• the mechanism is the DO instrumentation's, so a reset message arriving by any other path (an ordinary worker capture, the DO's own capture seam) is untouched;
• the exception message classifies as a transient platform failure through the existing shared classifyDurableObjectError, so this can never recognize a different set of messages than the worker seams do.

Everything the classifier does not recognize is kept, so a real defect thrown inside a DO — an alarm crash, a broken handler, the memory-limit reset the classifier deliberately excludes — still reports. session_dead is also kept: that disposition means our own code called ctx.abort, which is the application acting, not the platform. Worker-seam behaviour is unchanged.

Testing

Unit tests in the cloud observability suite: a code-update reset with the DO instrumentation mechanism is dropped (as are the other transient kinds the classifier knows), the same message on a non-DO mechanism is kept, and an unclassified DO-side failure is kept. One existing case that used the reset message to stand for "unclaimed DO failure" now uses a real defect message, which is what it was there to express.

This layer is unreachable black-box: the dropped event and the events kept beside it declare the same exception type and shape, and only the mechanism the Sentry SDK stamps separates them, so unit tests over the hook are the only place it can be pinned.

Mutation-checked: with the drop neutralized, only the three new drop tests fail.

• bun run typecheck green
• apps/cloud observability suite green (19 tests)
• e2e/cloud/sentry-otel-correlation.test.ts green

[github-actions]

Cloudflare preview

Torn down — the PR is closed.

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[cloudflare-workers-and-pages]

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