Made a short test in one of my ESX environments.
Added the following counters to the list of “REQUESTED_COUNTERS_KEYS”
cpu.ready
cpu.usage
cpu.usagemhz
cpu.demand
cpu.costop
Test against the ESX host and the vCenter was without problem.
All the counters returned values and the “cpu.usage” gave results for every single CPU core.
I don’t know what the problem was with the reverted werk.
We can only ask @jonas.kluger a he wrote the check 