Returns kill, death, assist, map, round, and player-round totals over the matches of the event, or of one stage or group. While the event is in play, a scope over more than 200 matches answers 400 validation_failed, also when filtered; narrow it with stageId or groupId. Completed events have no such limit. Requires the `analytics` entitlement on the Application owner and an active installation that covers the event. A successful read costs one `premium_api_calls` unit, and a failed read costs nothing.