def _initialise_action_states(self):
        """
        Some menu actions have on/off states that have to be initialised. Perform all non-trivial action state
        initialisations.
        Trivial ones (i.e. setting to some constant) are done in the Qt UI file,
        so only perform those that require some run-time state or configuration value here.
        """
        self.action_enable_monitoring.setChecked(self.app.service.is_running())
        self.action_enable_monitoring.setEnabled(not self.app.serviceDisabled)