Varnish Custom Statistics (VCS) is a real-time statistics engine allowing you to aggregate, display and analyze user web traffic, for enhanced decision making and optimization of your Varnish web caching operations. VCS is extremely flexible, allowing you to define the grouping of statistics easily using Varnish Configuration Language (VCL). Whatever traffic you want to analyze, VCS can capture the relevant data, from page popularity to device type. VCS requires a Varnish Enterprise subscription: https://aws.amazon.com/marketplace/search/results?x=0&y=0&searchTerms=varnish+enterprise