70% cpu, command "kernel"

It means something is hogging your kernel. Without any additional information it'll be impossible to tell.
 
It could be related to some periodic(8). Check logs and the setting:

/var/log/daily.log
/var/log/weekly.log
/var/log/monthly.log

/etc/crontab
/etc/periodic
 
What does this mean, and how do i fix this. Should i ?
I don't know, from the experience that happened to my notebook with the high elevation of the frequenc or temperature y and consumption of its cores it means that it won't take long to pass to a better life.
 
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