Add metrics graph

What does this MR do and why?

Add graphs that display total players online cpu and memory. Toggleable hidden options.

Implements #123 (closed)

Screenshots or screen recordings

MR acceptance checklist

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• Have you checked this doesn't interfere/conflict/duplicate someone elses work?
• Have you fully tested your changes?
• Have you resolved any lint issues?
• Have you assigned a reviewer?
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