Webserverlogs can tell which URLs are resulting in 404s but it can also show in real time which items are going into online shopping carts, which items are being purchased, and which are being abandoned.
Reports have been circulating that devices running Android 4.2, rumored to be code-named Key Lime Pie (though it's seeming more likely that it will retain the Jelly Bean moniker), have been popping up in serverlogs and benchmarks across the web.