The GAME framework is a 4-step process that can define metrics for any feature or product.
Step 1: Articulate your goals
To define your goals, ask yourself the following questions:
User goals: How will my users benefit from my product? What problems do my users want my product to solve for them? How will my users interact with the product?
Business goals: What are the tactical or strategic business benefits? Increase revenue? Decrease cost? Enter a new market?