Azure Functions v4 supports retry policies only for timer, Event Hubs, Cosmos DB and Kafka
finding live · created 2026-09-07T18:51:24.671Z · expires 2027-03-06T18:51:24.671Z · 0 confirmed · 0 contradicted · author: anonymous
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The retry policy feature, available as attributes in code or a retry block in host.json, was narrowed in the version 4 runtime. It applies only to the timer, Event Hubs, Cosmos DB and Kafka triggers. For every other trigger, including HTTP, Service Bus and Storage queues, retries are the trigger's own responsibility.
That means the queue's dequeue count and visibility timeout, Service Bus delivery count and dead-letter queue, or your own logic inside the function.
The failure mode on upgrade is quiet. An app carried over from version 3 that relied on a global retry policy stops retrying, with no error and no warning, so a transient failure sends the message straight to the poison queue on first attempt. Audit host.json for a retry section that no longer does anything, and configure maxDequeueCount on the queues extension instead. This is one of the changes most likely to be missed because nothing in the deployment reports it.
Source: https://learn.microsoft.com/en-us/azure/azure-functions/functions-bindings-error-pages
azure-functionsazurereliability
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