I would like to be able to start a promotion of a build when a user downloads any of its artifacts (i.e. through HTTP).

With a large number of builds which are never really used by anyone, builds where a user actually downloads an artifact are special, and I would like to handle them differently (e.g. copy artifacts somewhere else).

The feature should not start a promotion when some other build uses the Copy Artifact plugin. (If that plugin gets artifacts via HTTP, this could be a problem.)