Is it playing like we designed it to?
Game metric is where you collect data about the game as people play it and than analyze the data to try to make the gameplay experience better. The three core steps is telemetry, archive and data mining.
Most players do not approve of excessive data collection that run run on the players hardware. There are some basic things that can be done to make them hate you less.
Give players a way to opt-out of all or part of the data collection.