code: def hibernate(app):
      
      log("The database backup URL is...")
      backup_url = data.backup(app)
      log(backup_url)
  
      log("Scaling down the web servers...")
      heroku_app = HerokuApp(app)
      heroku_app.scale_down_dynos()
  
      log("Removing addons...")
  
      addons = [
          "heroku-postgresql",
          # "papertrail",
          "heroku-redis",
      ]
      for addon in addons:
          heroku_app.addon_destroy(addon)
docs: Pause an experiment and remove costly resources.