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The Broker supports a variety of queue alerting thresholds. Once configured on a queue, these limits will be periodically written to the log if these limits are breached, until the condition is rectified.

For example, if queue myqueue is configured with a message count alert of 1000, and then owing to a failure of a downstream system messages begin to accumulate on the queue, the following alerts will be written periodically to the log.

INFO [default:VirtualHostHouseKeepingTask] (queue.NotificationCheck) - MESSAGE_COUNT_ALERT On Queue myqueue - 1272: Maximum count on queue threshold (1000) breached.

Note that queue alerts are soft in nature; breaching the limit will merely cause the alerts to be generated but messages will still be accepted to the queue.