How to monitor RabbitMQ queues for silent outages when consumers disappear

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A RabbitMQ queue with messages but no active consumers can create a silent system failure without triggering errors. Warren Ops advises monitoring for queues where consumers equal zero, ready messages exceed zero, and the state persists for several minutes, excluding intentionally consumer-less queues. Related alerts should also detect stuck consumers with zero acknowledgment rates and queues where message growth outpaces processing capacity. The RabbitMQ management API and Prometheus plugin provide the necessary metrics for creating these monitoring rules. Implementing these alerts helps prevent data loss when messages expire or dead-letter queues fill unnoticed.

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