Network › network, under suggested monitors. The hub does not add the check until the second press.
Open the machine, then network › network. Under the device table, suggested monitors lists addresses that are not enrolled. front-desk is a printer on 10.1.1.50 (Brother). Add ping check is on that row, next to add as proxied, copy install, and ignore. Nothing has been pressed. The hub does not add the check from the scan alone.
Press add ping check once. The label turns red and says confirm: add ping check. A second press within a few seconds writes a ping check on this machine for 10.1.1.50. This shot stops on the first press, so the check is not added. Writing one yourself, with a name and how much loss is a failure, is Check that a host answers a ping. Ignore on the same row leaves it out of the suggestions — Ignore a device on the LAN.
Writing the same check by hand, with a name and a loss limit, is Check that a host answers a ping. Leaving the row out of the suggestions is Ignore a device on the LAN. The table above the suggestions is Read devices found on the LAN.