Hey sorry for the delay. Derik (below) is correct. Endpoint is how flow-monitoring refers to senders and receivers, so that's coming from NetFlow (NTA). Make sure that switch has flow export enabled and that it's pointed at your NTA collector server.
The top graph is specific to Netflow. So, unless your Netflow data includes traffic with the switches specific IP, this will always be an empty resource.
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Thank you derik!