Took me awhile to remember then find it but here is a package of utilities to monitor the system. Nothing friendly about these utilities. But very powerful. Depends how far down the rabbit hole ya want to go. It is deep......
sysstat docs and tutorial. You can write to a file and use isag to plot graphs from the datafile.
sudo apt-get install sysstat isag
I should add both top and sysstat get their info from /dev/proc which is where the kernel accounting is written. So you will be getting info from the same place just with stsstat you can configure it to get data over time as well as more specific data.
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