SYSTEM.ADMIN.PUBSUB.EVENT WebSphere MQ > Monitoring and performance > Event monitoring > Instrumentation events Event types WebSphere MQ > Administering > Administering multicast Multicast application monitoring The status of the current publishers and subscribers for multicast traffic (for example, the number of messages sent and received, or the number of messages lost) is periodically transmitted to the server from the client. When status is received, the COMMEV attribute of the COMMINFO object specifies whether or not the queue manager puts an event message on the SYSTEM.ADMIN.PUBSUB.EVENT. SYSTEM.ADMIN.TRACE.ACTIVITY.QUEUE WebSphere MQ > Monitoring and performance > Application activity trace > Application activity trace messages Application activity trace information collection Activity records are written to the new system queue SYSTEM.ADMIN.TRACE.ACTIVITY.QUEUE. They collect information about the MQI operations that an application pe