We've added an ability to easily differentiate between single and multiple add-on types:

1. Single instance add-ons allow only 1 instance of the add-on to be included in customers' subscription. This type is useful for add-ons such as: single sign-on (SSO), premium support, Snowflake integration, etc.
2. Multiple instance add-ons allow multiple instances of the add-on to be included in customers' subscription. This type is useful for add-ons such as: additional API calls, additional credits, etc.

The add-on type can be defined when creating or updating an add-on.