vC Ops can only collect the data if it's being provided by vCenter. Open vCenter and go the Performance > Advanced area, then see if the CPU Ready (ms) value has any data for those VMs in question. If the specific metrics aren't there, the vSphere hosts aren't providing them for whatever reason (host version or host communication issue usually). If they are, then vC Ops isn't collecting them and I'd suggest checking your attribute packages+assignment to ensure vC Ops is configured to collect them.
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