Chapter 20. Events

Operating and some server types keep their own log files and register a steady stream of information about incidents for that resource, from simple debug information to critical errors. Metrics are collected on a (more or less) set schedule. Events are entirely random, because they are based on real actions as they occur. Events, then, give a different perspective on resource performance.

Events monitoring tracks those streaming log file messages. In a sense, JBoss ON event monitoring is a filtered log viewer. When events are enabled, all of the log messages flow through JBoss ON's event viewer. However, the types of messages that JBoss ON records and displays can be limited in the event configuration so that only certain types of messages or messages matching certain strings are included in the events view.

A handful of resource types record and display events:

Default events are taken from standard log files. Custom resource types can identify event sources in logs or in asynchronous messaging systems such as a JMX notification or a JMS messaging system.