For the last little while I've been noticing odd CPU usage on my server but shortly after accessing the GUI it calms right down.  How can I find out what's causing this or is it some kind of glitch?  The graph goes back to the up and down if I refresh or switch to another page and come back, but flatlines if I stay on the dashboard.  See attached screenshot for details.  I took this screenshot about 30 sec after logging in to the GUI. I'm worried that somehow my server is compromised despite it not being exposed to the internet directly, I only access it via Wireguard VPN if I need in to it from the outside world.

 

 

 

Thanks

Best thing to figure out CPU usages would be the glances application (or NetData)