[root@zabbix ~]# zabbix_get -s localhost -k system.cpu.load
0.090000
[root@zabbix ~]# zabbix_get -s localhost -k system.cpu.load[,avg1]
0.080000
[root@zabbix ~]# zabbix_get -s localhost -k system.cpu.load[,avg5]
0.130000
[root@zabbix ~]# zabbix_get -s localhost -k system.cpu.load[,avg15]
0.120000
[root@zabbix ~]# zabbix_get -s localhost -k system.cpu.load[0,avg1]
ZBX_NOTSUPPORTED
[root@zabbix ~]# zabbix_get -s localhost -k system.cpu.load[1,avg1]