You can apply Universal Device Pollers to which object types?

Universal Device Pollers (UnDPs) are custom pollers that allow you to monitor specific aspects of your network devices using SNMP. You can apply UnDPs to any object type that supports SNMP polling, such as interfaces, nodes, and volumes. You cannot apply UnDPs to applications, because they are not SNMP-based objects. Applications are monitored using Application Performance Monitor (APM), which uses different methods, such as WMI, scripts, or agents, to collect data. References: Monitor custom statistics based on OIDs with Universal Device Pollers in NPM, Assign Universal Device Pollers to devices monitored in NPM, Add and assign Universal Device Pollers