Banner above topic for Duplicate Topics

One of the discourse forums I’m in has a feature where duplicate topics have a banner on top of them with a link to the original topic:

Is this a custom plugin? Can something like this be implemented on any Discourse forum, say letting mods mark a topic as duplicate and specifying another topic.

Thanks!

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This is a staff notice. To add this, click on the wrench and click this button:
image
Then, add whatever you want.
You can put this anywhere.

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