Monitor VMs load with Orchestrator

Hello,

I'd like to create a workflow to monitor the cpu load on given machines.

This post gave me some clues Re: Using vCO (vCenter Orchestrator) to monitor cluster utilization , but i'd like to know how often does the quickStats info refresh ? I'd like to check the load every 5 minutes, but I "always" get the same result. Even the value uptimeSeconds remains the same for quite a long time !

I use vm.summary.quickStats.overallCpuUsage to get the cpu usage. And by the way it's the same (long refresh rate) with myVcHostSystem.summary.quickStats.overallCpuUsage

Is there a better way to get the load on a VM ?

Thanks !