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What are the reasons that the “Total Inbound Msgs” and “Total Outbound Msgs”  on a topic can be different?


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All

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Total Inbound Msgs - Cumulative count of all messages delivered to a topic.

Total Outbound Msgs - Cumulative count of messages consumed from the topic by consumers.

Each consumer of a message increments this count independently of other consumers, so one inbound message can result in ‘n’ outbound messages (one per consumer) if ‘n’ consumers are subscribed to the topic. If the consumer was not running at any point in time, messages sent to that topic will be lost. The lost messages will not increase the total outbound message count. In this case, the total outbound message will be smaller than inbound. If no subscriber was started on a topic the total outbound message count will be zero even if it had inbound messages.