Is there a way to reliably detect by JSON-RPC or REST if a Confluence page has been created from a page template or not? Some kind of metadata or history information? I was not able to find any...
Nope. But you could give your templates a special label for this. Then any page getting created from that template will get the label as well. Assuming the users don't remove the label (big assumption) then you could query it up that way.
There are methods for getting pages by label. I think a label is really the easiest way to accomplish something like this. It isn't a sure thing because people can add and remove labels, but I've got no better ideas for what you are trying to accomplish. With a little bit of user training you may be able to mitigate them adding or removing the template label.
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