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I wanted to add functionality for controlling which labels/annotations are copied, but ended up with something closer to a rewrite.
I'm just putting this out here, but obviously there may be too many differences (many incompatible) for this to be merged.
The one rather significant change I'll call attention to is the use of a label rather than annotation for triggering the controller. This is important for performance because labels can be queried (selected), while with annotations the controller has to download every configmap and secret in the cluster.