https://www.zabbix.com/documentation/3.0/manual/discovery/low_level_discovery
Low-level discovery items “vfs.fs.discovery” and “net.if.discovery” are supported since Zabbix agent version 2.0.
Discovery item “system.cpu.discovery” is supported since Zabbix agent version 2.4.
Discovery of SNMP OIDs is supported since Zabbix server and proxy version 2.0.
Discovery using ODBC SQL queries is supported since Zabbix server and proxy version 3.0.