Help understanding cpu values returned by docker module


I have a test system for ELK using VirtualBox and Docker with 4 virtual cpu cores.

I've managed to enable metricbeat in a container with the docker module enabled (only this module) and I am receiving readings from the docker infrastructure, all seems ok.

It shows strange readings for cpu where values cpu usage raises as up as 300% and more.

I don't know how to interpret these readings. Are they wrong? Is that the sum off all 4 cores? Can I add some kind of automatic correction for these values?

Thank you!

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