Number of Pending Messages, Messages enqueued, Messages dequeued included in the ACTIVEMQ Control Panel

Number of consumers consumers this is consumer-side consumer numbers

Number of Pending Messages messages waiting to be consumed this is the quantity of the current outstanding queue. Can be understood as total number of received-Total out of queue
Messages enqueued The total number of messages entered into the queue, including the queue. This number only increases.
Messages dequeued out a queue of messages can be understood as consumption of this consumption of the quantity
This has to be understood in two ways.
In queues it is equal to the total number of incoming queues (because a message will only be consumed once), if not for the time being because the consumer has not yet been able to spend it.
In topics it causes the quantity to be higher than into the queue because of the multi-consumer.
A simple understanding of the above means that
When a message enters this queue, the message waiting to be consumed is 1, and the message entering the queue is 1.
When the message is consumed, the message waiting to be consumed is 0, the message entering the queue is 1, and the message out of the queue is 1.
When a message comes in, the message waiting to be consumed is 1, and the message entering the queue is 2.


Pending Messages and Incoming queue numbers without consumers
When there is consumer spending, pedding will reduce the queue will increase
In the end, as many as the queue and the number of out queues
And so on, messages entering the queue and messages out of the queue are pools, and the messages waiting to be consumed are water currents.

Number of Pending Messages, Messages enqueued, Messages dequeued included in the ACTIVEMQ Control Panel