E-Commerce KPIs

I was searching for some sort of definition as to what are some good KPIs for an ecommerce business. I came across this article:

32 Key Performance Indicators (KPIs) for Ecommerce

Some of these make perfect sense, like conversion rate, site traffic patterns, and sales. Some of the other KPIs are interesting. Including, the customer service KPIs which, in my experience, I have never taken into account. I suppose the addage “the customer is king” really is important.