[FEATURE REQUEST] - Keep the lobby CPU graph persistent and show staurated CPU

[waxhead]

1st of all - thanks for OPNsense - by far better and makes more sense than a certain other sense which does not make sense anymore... anyway ...

In lobby->dashboard the system information widget shows CPU usage. In a dual CPU system it appears to show  the combined CPU usage e.g. if one CPU is at 100% and the other at 0% the widget shows 50%. That's ok , but I wish the CPU widget either showed pr. CPU or at least changed the color of the graph to RED if *ONE* CPU is at 100%.
The reason for this should be obvious - some task that can't be parallelized will hog the CPU and the widget is giving the impression that the firewall is running just fine.

The CPU graph (just like the traffic graphs) are NOT persistent and does not show any history unless you keep the lobby->dasboard up for a while - in my opinion the graphs would have been better if they showed some history.

Please consider changing this for an update / for the 19.7 series