You work as a data scientist for a gaming company that manages a popular online multiplayer game. In this game, teams with 6 players each compete against each other in 5-minute battles. The game continually sees an influx of new players every day. Your task is to develop a machine learning model that can automatically assign available players to teams in real time. User research has indicated that players find the game more enjoyable when they are matched with teammates and opponents who have similar skill levels. Considering this, which business metrics should you track to effectively measure the performance of your matchmaking model?