Heroku Cedar: 
This book will show you how to build a scalable and reliable high-traffic web application using Heroku Cedar as a platform. Originally available only for Ruby (on Rails), but now extended for many more languages, Heroku Cedar is a very interesting choice. The application we’ll build is a ping service, but with characteristics that meet the requirements of modern web apps: cheap (many checks), high frequency, low latency, and trending. With this application we’ll show you how to architect, build (using existing and custom add-ons), and operate a full-blown, high traffic web application. We’ll use different technological components, such as a good dashboard, efficient scheduling processes, and scalable data processing.
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