Starting today, Amazon GameLift emits 18 new metrics that will give you deeper insight into what is happening with your Queue placements. These new metrics track information such as how often your lowest latency regions and lowest priced fleets are selected by Amazon GameLift Queues. With this data, you can optimize to lower latency for players on a global scale and reduce your server hosting costs. 

Source: Amazon Web Services News Amazon GameLift introduces new game session placement metrics