Simple Message Queue (formerly MNS) (SMQ) provides three metrics in the console to help you monitor queue status: message count, number of messages visible, and number of messages delayed.
These metrics summarize different types of messages:
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message count: the total number of messages, including both sent and unsent messages.
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number of messages visible: the number of unprocessed messages.
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number of messages delayed: the number of messages that have a configured DelaySeconds parameter.