Sqs

You will learn what poison messages are, how dead-letter queues work in SQS, RabbitMQ and Kafka, how to alert on and own a DLQ, how to redrive safely, and what changes when the consumer is an LLM agent.

A dead letter queue nobody reads isn't a safety net, it's a data-loss incident running on a delay — here's the replay path most teams never build, and why agentic pipelines make triage harder, not easier.