CzyerChen opened a new pull request, #12109:
URL: https://github.com/apache/skywalking/pull/12109

   ### <Feature 
description>https://github.com/apache/skywalking/discussions/12063
   - [x] Update the documentation to include this new feature.
   - [x] Tests(including UT, IT, E2E) are added to verify the new feature.
   - [x] If it's UI related, attach the screenshots below.
   - [x] Update the [`CHANGES` 
log](https://github.com/apache/skywalking/blob/master/docs/en/changes/changes.md).
   
   For ActiveMQ Classic cluster:
   
   <img width="848" alt="image" 
src="https://github.com/apache/skywalking/assets/22817918/ce921123-6328-47d6-a9fa-eab19d35407d";>
   
   - System Load: range in [0, 100].
   - Thread Count: the number of threads currently used by the JVM.
   - Heap Memory: capacity of heap memory.
   - GC: memory of ActiveMQ is managed by Java's garbage collection (GC) 
process. Compatible with JDK 1.6-17 with ActiveMQ classic(5.10.x ~ 6.1.0)
   - Enqueue/Dequeue/Dispatch/Expired Rate: growth rate of messages in 
different states.
   - Average/Max Enqueue Time: time taken to join the queue.
   
   For ActiveMQ Classic broker:
   
   <img width="844" alt="image" 
src="https://github.com/apache/skywalking/assets/22817918/bd499ac2-3e68-44c8-acc0-75ee90584a20";>
   
   - Uptime: duration of the node.
   - State: 1 = slave node, 0 = master node.
   - Current Connentions: number of connections.
   - Current Producer/Consumer Count: number of current producers/consumers.
   - Increased Producer/Consumer Count: number of increased producers/consumers.
   - Enqueue/Dequeue Count: number of enqueue and dequeue.
   - Enqueue/Dequeue Rate: rate of enqueue and dequeue.
   - Memory Percent Usage: amount of memory space used by undelivered messages.
   - Store Percent Usage: space used by pending persistent messages.
   - Temp Percent Usage: space used by non-persistent messages.
   - Average/Max Message Size: number of messages.
   - Queue Size: number of messages in the queue.
   
   For ActiveMQ Classic destination:
   
   <img width="839" alt="image" 
src="https://github.com/apache/skywalking/assets/22817918/a0eb02fd-62b8-417b-8804-06046a128432";>
   
   - Produser/Consumer Count: number of producers/Consumers.
   - Queue Size: unacknowledged messages of the queue.
   - Memory usage: usage of memory.
   - Enqueue/Dequeue/Dispatch/Expired/Inflight Count: number of messages in 
different states.
   - Average/Max Message Size: number of messages.
   - Average/Max Enqueue Time: time taken to join the queue.
   
   Due to the shortcomings of the activemq-5.x agent plugin, it can not suit 
hierarchy definition now.
   I have to fix the agent part later, then push the hierarchy definition.
   
   


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