Install Exceptional in your Heroku Rails app
Use the Heroku command line tool to add the Exceptional add-on to your Rails app
$ heroku addons:add exceptional --app APP_NAME
Where APP_NAME is your Heroku application name. You will now be able to click through directly from your Heroku app dashboard through to your Exceptional errors list!
Check out the Heroku docs for further details about Heroku deployment.