In the PRTG we want to set up dependencies, but we don't know it properly. For example, we have 2 firewalls, fw1 and fw1 behind fw2. We would like to set if fw1 goes down, all sensors of fw2 will be paused. And. If only fw2 goes down, the ping sensor will go down and the other sensors will be paused. This setting will not be achieved. How should it be set?