The basics (Standard)
In Statistics › Insights: new and returning players, peak hours, population and FPS trend, session lengths, top weapons and killers, causes of death. Choose 7, 30, 60 or 90 days, up to what your plan keeps. Days and hours follow the server time zone.
Advanced and export (Pro)
Retention cohorts (how many come back after day 1, 7 and 30), the churn list of regulars who stopped coming, and kill and death heat maps on the map. Every table can be exported as CSV.
Good to know: A CSV carries player names and Steam IDs, so only moderators and above can export it.