What product metrics do you collect?

Product metrics depend on the type of product, but typically include the following key indicators:

• User activity: DAU (Daily Active Users), MAU (Monthly Active Users), number of sessions, time on site/app.
• Engagement: number of clicks, page views, depth of view, conversion to target actions.
• Retention: percentage of users returning after 1, 7, 30 days.
• Conversion: percentage of users making a purchase, subscription, or other target action.
• Errors and stability: number of errors, crashes, response time.
• Monetization: average revenue per user (ARPU), average check, LTV.

In Go applications, metrics are usually collected using tools like Prometheus, exporting counters, histograms, and timers for analyzing user behavior and service performance.