You would like to know whether is it possible to cluster the Aurea Messenger (aka Sonic / CX Messenger) brokers used with Aurea Monitor (aka Actional / CX Monitor) to increase performance.
The clustering of Aurea Messenger broker is possible. You may add another Fault Tolerant (FT) broker in cluster and update the url in post-custom.sh and in the profile in Aurea Monitor Server.
However, this is not necessary unless you observed any slowness on the broker used for Aurea Monitor communication, because Aurea Monitor Server and Launcher (AI/Agent) doesn't generate too much traffic.
The steps to configure an Aurea Messenger Broker Cluster are available in the Aurea Messenger MQ Configuration and Management Guide under the "Configuring Aurea Messenger SonicMQ Brokers" chapter in the "Clusters" sub-chapter.