Basic Walk-Through This section describes how to create a basic threshold for a single, system-wide variable: the number of logged-in users. Our threshold will tell Horizon to create an event when the number of logged-in users on the device exceeds two, and re-arm when it falls below two. Before creating a threshold, you need to make sure you are collecting the metric against which you want to threshold. Determine you are collecting metric In this case, we have chosen a metric (number of logged-in users) that is collected by default. We are also using data collected via SNMP. (For information on other collectors, see Collectors.) In the Horizon UI, choose Reports>Resource Graphs. Select one of the listed resources. Under SNMP Node Data, select Node-level Performance Data and choose Graph Selection. Scroll to find the Number of Users graph. You can click the binoculars icon to display only this graph. Thresholding Create a Threshold