1. A method comprising: maintaining subscription data that identifies a group of targets that subscribe to a particular image; wherein the particular image represents a standard to follow for targets that belong to the group of targets; wherein the particular image includes a first image version having a first set of source components; receiving an update to the particular image; in response to receiving the update to the particular image, generating a second image version for the particular image; wherein the second image version includes a second set of source components that are different than the first set of source components; updating two or more targets in the group of targets that subscribe to the particular image based on the second image version for the particular image.