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You have to mention the app name against which you intend to run the command from CLI despite having a single app.
When running commands from CLI, it is advised to always mention the app name using
--app 'app-name'
against every command.
If you want to avoid doing that, you can set your heroku git remote app repo to a specific app, using the command
heroku git:remote -a 'app_name'
That should help you not having to type the app_name every time.
About scaling the dynos, you can read here.
Source:stackexchange.com