As a PM at Meta, what key metrics would you track for Meta's Workplace Chat?

Focus on identifying metrics that reflect user engagement, retention, and overall product health for Workplace Chat. Consider both quantitative metrics, such as daily active users (DAU), message volume, and user growth rate, and qualitative metrics like user satisfaction scores or Net Promoter Score (NPS). Discuss how these metrics can inform product decisions and improvements, and think about how to segment your metrics by user demographics or usage patterns to gain deeper insights. Additionally, consider the alignment of these metrics with Meta's broader business goals and how they can drive value for both users and the company.