can't cpu and memory utilization graph in the device page

can't cpu and memory utilization graph in the device page

Hello support,
my problem is like that:
I added new template device and add for it new custom monitors and also cpu, memory and disk utilization monitors of net-snmp.
I associated the new template to a linux monitored station with net-snmp.
all the monitors work fine when I test them, but the cpu and memory graph on the main snapshot page is not showing anything ("No Data Available"), on the other hand disk utilization graph work fine.

can you help me resolve this problem?





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