[Feature]: Add a toggle button to display delta or unstacked values (what changed since last sample?)

[gjwebber]

Describe the feature you would like to see

Let's take the Docker CPU Usage graph as an example. Currently, if there is a spike in usage by one container, it's not always easy to see which one caused it - the whole graph shows the spike. Example:

I'd like to see a button that allows the user to toggle between views - Total usage stacked as we have it today, and individual usage - either current CPU or delta CPU. By delta I mean current sample - previous sample. This will allow the user to see what spiked and by how much.

Describe how you would like to see this feature implemented

As a toggle button, either system-wide or by graph where it makes sense. I think selective per graph makes more sense, as it's only a few where this could be useful - maybe even only Docker CPU Usage.

Describe any alternatives you've considered

No response