When the PersistentUnsubscribe property is set to true, the probe will unsubscribe an old session before subscribing to a new session.
The probe stores subscription information in a temporary file. If the probe is disconnected or shut down ungracefully, the probe will check against this temp file and detect the old subscription during the next probe start up. The probe will then attempt to unsubscribe the old session and remove the old subscription file before proceeding to subscribe to a new session.
If multiple probe instances exists, refer to the Name property to differentiate the instances.
When the property is set to false, the probe will only unsubscribe an old session when shut down. Subscription information will not be stored.