What is Extensions URL in Tableau Server

Hello,

I recently noticed the “Add Extension URL” feature in the Tableau Server settings. As I understand it, dashboard and visualization extensions are externally developed programs used to extend Tableau’s native visualization capabilities.

However, I have a few questions:

(1) What can be done by adding an extension URL? 

(2) Is it possible to track who added a specific extension URL? 

(3) Is it possible to identify which dashboards or content are connected to a given extension URL?

I would appreciate your clarification.

Thank you.