Can't monitor Memory Utilization with [CLI] in Centos 7

Can't monitor Memory Utilization with [CLI] in Centos 7

I'm use Opmanager (Build Number : 12300) and try to monitor Memory Utilization with Protocol CLI on Centos 7
but always show value = 0

Device Detail as below
Type = Linux
Encoding = ISO-8859-1
Vendor = net-snmp

How to configure to monitor Memory Utilization with [CLI] in Centos 7?

                New to ADSelfService Plus?