Using Messaging Metrics

Messaging metrics are the Java metrics enabled in WSO2 MB for the purpose of monitoring MB-specific statistics.

Follow the steps given below for instructions on using the Messaging Metrics dashboard.

1. Log in to the management console of MB and click Monitor -> Metrics -> Messaging Metrics. 
   
2. The View Metrics page will open. At the top of this page, you will find the following panel:
   
3. First, select the Source from the drop-down list. In a clustered setup, you must specify the MB node that you want to monitor.
4. You can specify the time interval for which the statistics displayed are valid. By default you will see statistics from the last 5 minutes.
5. In the Views section, you will find buttons corresponding to the different types of metrics that you want view. You can click the relevant button to view the statistics. Given below are the statistics corresponding to each button:
   
   • Disruptor

     

     Metric	Description
     Total Messages in Inbound Disruptor	The Disruptor is a new open-source concurrency framework, designed as a high performance mechanism for inter-thread messaging. The current number of messages in the inbound disruptor can be viewed here.
     Total Acks in Inbound Disruptor	The current number of acknowledgments in the inbound disruptor.
     Total Messages in Outbound Disruptor	The current number of messages in the outbound disruptor.

      

      
   • Publish & Subscribe

     

     Metric	Description
     Total Queue Subscribers	This metric shows the total number of active queue subscribers for a particular MB node. This is an INFO level metric.
     Total Topic Subscribers	The total number of active topic subscribers.
     Total Channels	The total number of active channels.

      

      
   • Messages & Acknowledgements

      

     Metric	Description
     Messages Received/sec	This metric provides the number of messages received per second by a particular MB node. This metric is calculated when a message reaches the server.
     Messages Published/sec	This metric provides the number of messages published per second. This metric is calculated when the server publishes a message to a subscriber.
     Acknowledges Received /sec	This metric provides the number of acknowledgments received from publishers per second.
     Acknowledges Sent /sec	This metric provides the number of acknowledgments sent to publishers per second.

      

     
     
   • Database
     

     

     Metric	Description
     Database write latency	The average time taken for database write calls.
     Database read latency	The average time taken for database read calls.
     Database Method latency	The average time taken by message store implementation methods.