End the queue producer span when a send rejects

[ayaangazali]

instrumentQueueSend and instrumentQueueSendBatch in packages/otel-cf-workers/src/instrumentation/queue.ts called span.end() only after the wrapped call resolved, with nothing wrapping it. So a rejected queue.send() or queue.sendBatch() leaves its span unended and therefore never exported: the send disappears from the trace and the failure leaves no record, which is exactly when you would want the span. The queue consumer handler further up the same file already guards its own path, and the other bindings do too, so the producer side was the odd one out.

Both now record the exception, set ERROR, and end the span in a finally, rethrowing the original error untouched. This is the same fix as #201 for Analytics Engine, found by sweeping the instrumentation directory for files whose span.end() count exceeded their finally count.

There was no test file for the queue bindings, so I added one covering a successful send plus both rejection paths. The two rejection tests fail on current main with expected [] to have a length of 1, which is the span that never arrives. Ran the repo preflight and pnpm run check, both green. Patch changeset for @pydantic/otel-cf-workers included.

quick disclosure: built with Claude Code's help and I went through the diff myself before opening. Freshman still learning the Workers side, so tell me if the producer span should behave differently on failure :)

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• .changeset/queue-send-error-handling.md
• packages/otel-cf-workers/src/instrumentation/queue.ts
• packages/otel-cf-workers/test/instrumentation/queue.test.ts

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📝 Walkthrough

Walkthrough

Queue send and sendBatch instrumentation now records rejected operations as span errors, rethrows the original errors, and always ends spans. Tests cover successful and failed operations, span attributes, completion, error status, exception events, and error propagation. A patch changeset documents the behavior.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: ending queue producer spans when sends reject.
Description check	✅ Passed	The description directly explains the queue instrumentation fix, tests, error handling, and changeset.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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