The WebSphere MQ probe for the channel initiator, command server, listener and trigger monitor all operate in a similar manner and will simply restart any component that has failed.
The process monitor facility will request a restart of the resource as soon as any component has failed.
The channel initiator, command server and trigger monitor are all dependent on the queue manger being available. The listener has an optional dependency on the queue manager that is set when the listener resource is configured and registered. Therefore if the queue manager fails the channel initiator, command server, trigger monitor and optional dependent listener will be restarted when the queue manager is available again.