Metricbeat to show network packets over time

I have metricbeats running on windows server and would like to see a graph of the network traffic over time, to see if i am maxing out network card.

I can see the network and the and, but these metrics seem to be accumuliative values so would want need to do a sum of current value minus last value to get current bytes in / out. Unless you clever people know of a better way to do this.

Thanks in advance

As the value is a counter you have to take the derivative to show the recent changes:

Thanks ruflin,
I think I understand the document, but wonder how do i implement that into my environment
Sorry if this is obvious

I have found this and it answers what i want to acheive

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