We use the red/yellow/green stars for a dashboard. The resulting code generated includes alternative text in 4.3.7, which is a positive change from the past version we used. However, the alt for these stars is:

alt="(red star)"
alt="(star)"
alt="(green star)"

Alternative text should never have the parentheses unless needed to represent parenthetical information, which wouldn't include stars.

In addition, since you are providing multi-color stars, the color is important. Perhaps not in all cases, but since it is in some it is necessary to include the color for all of the stars. Therefore, the alts should be:

alt="red star"
alt="yellow star"
alt="green star"

This change will help the blind members of my team use Confluence.