You would like to know whether one Aurea Messenger Broker is enough for the proper functioning of Aurea Monitor.
This is important because when upgrading your Aurea Monitor (aka Actional / CX Monitor) to v11.x (2020) or above you were required to create an Aurea Messenger (aka Sonic) broker in order to enable Server - Agent Communication for Aurea Monitor. And you want to make sure that one broker is enough from a performance perspective.
The Aurea Monitor Server and Agent do not generate too much traffic. It creates only two durable and two non-durable subscriptions that should be used for communication. Meaning: one broker should be enough for the proper functioning of Aurea Monitor.
For reliability purposes, a fault-tolerant configuration can be configured using two brokers in Active/Standby mode: when the Active broker fails, the Standby (aka Backup) broker takes over the active role. For more information about configuring Backup Broker read chapter "Configuring Broker Replication - Backup Brokers" in the Aurea Messenger MQ Configuration and Management Guide.