GameLift(https://aws.amazon.com/gamelift/). It includes not only GameLift Client and Server SDK but also a manual for how to build and upload dedicated server on GameLift. It has widgets for server browsing of GameLift as well.
https://ue4plugin.wordpress.com/2017/06/02/integrate-amazon-gamelift/
Editor GameLift classes settings
GameLift server browser
Upload dedicated server build
Scaling
