Improve summary graph of huge pages

[dusatvoj]

Hello, I think there's a space for improvement of huge_pages graph at dashboard https://grafana.com/grafana/dashboards/1860-node-exporter-full/ . The preferred way for me is the graph which shows stacked data like: "commited", "used", "free".

I'm tunnig my postgresql dbs and I want to look at graph which shows me:

• how many huge_pages has this server in total?
• how many huge_pages are used?
• how many huge_pages are commited but not allocated?
• how many huge_pages are free? (total MINUS commited MINUS used)

(the same approach like you did the graph "memory stack" in "CPU / Memory / Net / Disk" section)

Thank you for your work :pray: !