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flow variable system.interface.interface_name not working

The documentation lists this flow variable to get the IP address of the MP/RTR that is handling the request: 

system.interface.interface_name

I have tried using this in a policy but it comes up null. 

We are using Apigee Edge, OPDK

THe goal is to get the ip address of the specific node that is handling the request. this is for troubleshooting purposes

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