What is experiment assignment table , aviation metric in configure experiment analysis?

the activation metric is a metric that is used if you need to assign your users into variations before they see the actual experiment. (like they may not have scrolled to see the module, or its in a modal). You can fire an event which will record the actual viewing of the experiment, create a metric for this event in GrowthBook, and then add that as an activation metric for the experiment

So how does activation metric work for revenue?