Metricsets CPU what metric to use

Elastic Stack Beats
1

On 7.9 Metricbeat-Metricset-CPU metrics I see these two entries. which one should I use for total CPU percentage

system.cpu.total.norm.pct  0.026
system.cpu.total.pct  0.211

In the documentation I don't see cpu.total mentioned (System fields | Metricbeat Reference [7.9] | Elastic)

As per documentation: system.cpu.total.norm.pct represents the percentage of CPU time in states other than Idle and IOWait, normalised by the number of cores. Do I need to add IOWait system.cpu.iowait.pct ?

OR Alternately can I just see system.cpu.idle.pct, If IDLE is less than 20% we need to be alerted right ?

2 
system.cpu.total.norm.pct

It is there in the documentation I missed it: The percentage of CPU time in states other than Idle and IOWait, normalised by the number of cores.

I guess I will have to use the system.cpu.total.norm.pct

The question on the iowait is still open