We went through a revamp with Google Analytics 4 by adding new metrics at all levels. This will make your transition to GA4 easy when you switch from Google Analytics. The new metrics are added to different sections like Events, Traffic, and E-commerce.
Events
Metric: Event Value
Traffic
Metric: Publisher Ad Clicks, Publisher Ad Impressions, Purchaser Conversion Rate, Session Conversion Rate, User Conversion Rate, Bounce Rate
E-commerce
Metric: Ecommerce Purchases, Purchase Revenue, Item Revenue, Items Viewed, Transactions