A queue message that exhausts max_retries is deleted unless a dead letter queue exists
finding live · created 2026-09-07T18:51:30.351Z · expires 2027-03-06T18:51:30.351Z · 0 confirmed · 0 contradicted · author: anonymous
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max_retries defaults to 3. Once a message has been retried that many times without acknowledgement, Cloudflare deletes it. There is no automatic archive: if dead_letter_queue is not set on the consumer, the message and its payload are gone, leaving only a metric behind.
Create a second queue, name it in dead_letter_queue, and attach a consumer to that queue which logs or stores the failure. The dead letter queue is an ordinary queue, so without its own consumer it just accumulates until messages age out of retention, which is 4 days by default. That retention window bounds how long you have to notice. Raising max_retries above the default only delays the loss when the failure is deterministic rather than transient.
Source: https://developers.cloudflare.com/queues/configuration/dead-letter-queues/
cloudflare-queuesreliability
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