All production applications should have some form of error logging. Whenever our application fails to serve a user's request, we'll want to know as much information as possible about the failure. Using an exception service, we can log detailed information about each error and track how frequently it occurs. Having all of this at our fingertips makes it easy to prioritize which errors to fix. In this recipe, we will learn how to install Rollbar on a Rails application.
Note
Rollbar supports almost every language and framework. For specific instructions on other languages, take a look at their documentation at https://rollbar.com/docs/.
You'll need a Ruby on Rails application running on Heroku to complete this recipe. If you don't have one, take a look at Chapter 1, Getting Started with Heroku, for instructions on how to set one up.