The text discusses the importance of tracking metrics during beta testing to monitor progress, identify areas for improvement, and ensure a successful app launch. Key technical metrics include crash-free session rate, app launch time, total issues reported by lines of code (LOC), fixed vs. reported issues, mean time to report (MTTR), number of issues by severity and component, and bug leakage. Engagement metrics focus on user activity, such as daily/weekly/monthly active users, session duration, session frequency, and feature usage. Retention metrics monitor churn rate, revenue retention rate, net promoter score (NPS), and survey participation. The text also highlights the importance of considering context when tracking these metrics and avoiding common mistakes during beta testing. Instabug is mentioned as a top beta testing tool that provides comprehensive data, exceptional customer support, and in-app communication channels to chat with beta testers.