When people exhaust all content in a stream, Marketo can send you a notification. You can disable/enable the notifications based on your needs. Here's how.
1. Go to Marketing Activities.
2. Select an engagement program and click the Setup tab.
3. Double-click Exhausted Content Notifications.
4. Select Off (or On) and click Save.
Super! If you enable notifications, you will see something on the stream itself as well as receive an email notification.