We currently allow extensions to set a background color for status bar items limited to statusBarItem.errorBackground. This is a very strong red indicator that should be used for error cases.

To give extensions a way of indicating warning situations, we should introduce another color that is less strong. Examples include a indication that some feature is not enabled and thus the experience may be less than ideal (though not an error case).

Some ideas:

The former would be a new color for warning, the latter would be exposing our existing prominent color to extensions.

//cc @egamma