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You can mark images as deprecated, which will prevent new environments from being created off of that image. However, users can continue using existing environments created with the now-deprecated image and edit provisioning parameters, e.g., CPU Cores, memory, and disk space.
To deprecate an image, go to Images, then find the image you want to deprecate. Click Actions > Edit Image, and select the checkbox in the Edit Image dialog. You may want to update the Description as well to indicate that the image is deprecated.