[CentOS] Increase CPU usage on HV after upgrade (7.2 -> 7.3)

Subscriber wrote:
> Hello Gianluca,
>
> Wednesday, January 18, 2017, 3:54:15 PM, you wrote:
>
>> In the mean time, if you have not disabled it, you should find some
>> collected statistics from sysstat/sar.
>> Look at the sarXX files under /var/log/sa. They should be kept for 30
>> day
>> by default in CentOS 7.
>
> Unfortunately, on that host such statistics is disabled.
<snip>
That's surprising. That's such an old, low-level daemon/reporting tool....
Was it disabled deliberately? And why?

       mark