What are the key metrics you would use to measure the success of Google Sheets?

Focus on identifying both quantitative and qualitative metrics that reflect user engagement, retention, and overall satisfaction with Google Sheets. Consider metrics such as daily active users (DAU), monthly active users (MAU), user growth rate, and churn rate. Additionally, think about user feedback metrics like Net Promoter Score (NPS) and customer satisfaction (CSAT) scores. Discuss how these metrics can provide insights into user behavior and product performance, and be prepared to explain why each metric is important for assessing the success of Google Sheets specifically.