How to display RAM load properly?

1

I use Metricbeat 6.1.3
I have such issue:
I need to create graph in Grafana 5x for visualizing RAM usage for each server.
I know that I should group by beat.hostname (terms) and @timestamp(Date histogram). But I don’t know how to take percentage that each process occupy in main memory for the server and then sum that all that percentages. And all of that in cut for each server in one graph.

2

found field system.memory.actual.used.pct
It helps.

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