Metric visualization issues in 6.1.1

[asawariS]

@thomasneirynck following up on slack chat, opening this to capture a couple of issues in the metric visualization in version 6.1.1

1. Padding around the metrics text is messed up. See comparison between 6.0 (top) and 6.1 (bottom) in the screenshot

2. 6.1 removed the ability to change the color scheme on the legends -- so one is forced to use the default color scheme which doesn't always work. For example the green with black text is really hard to read.

[timroes]

The color contrast issue is fixed via #16296 by automatically detecting whether we need light o dark color on that background.

[timroes]

I'll be closing this issue, since the color contrast has been fixed, and that the legend is not existing anymore is expected behavior for now, but please feel free to open a feature enhancement to make individually colors metrics (beside the existing conditional coloring).