How to rollback heroku with 0 downtime

Disable preboot

heroku features:disable -a powr-staging preboot

Find the version to rollback

Note: you can also rollback within Heroku's UI

heroku releases -a powr-staging

Rollback to desired version

heroku rollback v4652 -a powr-staging

Re-enable preboot

heroku features:enable -a powr-staging preboot