App Platform is a Platform-as-a-Service (PaaS) offering that allows developers to publish code directly to DigitalOcean servers without worrying about the underlying infrastructure.
Dedicated egress IP addresses are a paid feature that allows your app to connect to resources outside of DigitalOcean using a static IP address and allow you to restrict external resources to receive only outgoing traffic from your app. Dedicated egress IP addresses persist through redeployments but are removed from the app if you disable the feature or the app is destroyed.
You can add a dedicated egress IPs to your app after you deploy the app. To do so, in the DigitalOcean Control Panel, go to the Apps page and click your app. Click the Settings tab, scroll to the Dedicated Egress IP Addresses section, and then click the Edit button beside the section.
In the Edit menu, click the Add Dedicated Egress IP button. This assigns two IP addresses to your app and triggers a redeployment.
To remove a dedicated egress IP address, in the same Edit menu, click Release Dedicated Egress IPs. This removes the IP addresses from the app and triggers a redeployment. Once IP addresses have been released, the same addresses cannot be re-added to the app.