'Stop monitoring a process.
The uuid+service_name will be removed from the monitored processes.
The service must be disabled **after** unregistering, otherwise if
process monitor checks after you disable the process, and before
you unregister it, the process will be respawned, and left orphaned
into the system.
:param uuid: An ID of the resource for which the process is running.
:param service_name: A logical service name for this process monitor,
so the same uuid provided via process manager
can reference several different services.'

def unregister(self, uuid, service_name):

    service_id = ServiceId(uuid, service_name)
    self._monitored_processes.pop(service_id, None)
