I've created a custom poller. When that custom poller equals a certain value, I want that node to be displayed as down. I'm reading through the documentation but am not understanding if I can do this. Say one of my custom pollers is monitoring a fan on a box. If the MIB value for that fan indicates that it's not working I want to be able to show the end user which box it is just by looking at the network map on the web interface.