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Last updated October 30, 2026
Fir-generation apps can opt in to app-level idling. When enabled, Heroku scales an eligible app’s web process to zero after 30 minutes without web traffic. The next web request wakes the app and can take longer to complete while the web dyno starts.
You must configure the app with exactly one web dyno. The feature supports all Fir dyno tiers and doesn’t affect worker processes or apps configured with more than one web dyno.
Features added through Heroku Labs are experimental and may change without notice. These features are non-SFDC applications. Refer to your Main Services Agreement for additional information.
Enable App Idling
To enable app-level idling, run the command:
$ heroku labs:enable fir-app-idling -a example-app
Disable App Idling
To disable app-level idling and restore normal web process scaling, run the command:
$ heroku labs:disable fir-app-idling -a example-app