Containers are no longer destroyed, they just sleep and now have a persistent filesystem. A sleeping container means your app is idle until it is woken, such as by someone visiting an URL endpoint defined in your app or some other input depending on the functionality of your app.
Can you clarify what “active” means. I have an app that listens on websockets and generates push events, but has much less frequent incoming connections.
Will I get in trouble for using uptimerobot or something to keep it awake?