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The label `__meta_digitalocean_image` expose the `slug` of the image and the `slug` is only present in the public images. To refer a user-generated image (`snapshot` or `custom`) we can use the image's display name. See: https://developers.digitalocean.com/documentation/v2/#images Signed-off-by: Matteo Valentini <matteo.valentini@nethesis.it>