Microsoft Azure · Associate
Microsoft Certified: Azure AI Cloud Developer Associate
If the worker dies after processing but before completing the message, the lock expires and the message is redelivered. It's the same model as SQS's visibility timeout. Service Bus duplicate detection dedupes repeated sends, not processing: the worker must be idempotent.
After max_delivery_count deliveries (10 by default) the message goes to the $DeadLetterQueue subqueue, which counts towards the entity size. If it piles up, the main queue starts rejecting sends with QuotaExceeded. You need alerts on the dead-letter count and a process to reprocess or discard.
For the scale rule to use a managed identity, set the identity property instead of auth. The portal doesn't support it: use IaC or CLI.
Letra Chica