def get_hosts_to_notify(self, context, router_id):
        state = agentschedulers_db.get_admin_state_up_filter()
        agents = self.get_l3_agents_hosting_routers(
            context, [router_id], admin_state_up=state, active=True)
        return [a.host for a in agents]
Returns all hosts to send notification about router update
dataset/ETHPy150Open openstack/neutron/neutron/db/l3_agentschedulers_db.py/L3AgentSchedulerDbMixin.get_hosts_to_notify