I've recently come across this term in the context of Usability~ while I
understand what a sunset review is for government agencies; I don't know
what it means when applied to a web site.
My assumption would be temporary features that have a time limit, i.e.,
maybe a B page that runs temporarily, or a week long focus on some widget
the company wants to sell. Am I off track here? Oh, and the object of such a
review: usefulness, productivity, profitability, whatever applies?