Circuit Breaks fake responses


Currently, Kong has a strategy to check the availability of the upstreams and based on that take decision. My question is if there´s any way to return fake/custom data when all the upstream are down.

Imagine the follow scenario.

My upstream service returns a random string.
This service is exposed by kong
for some reason, the service cluster is down

There´s a way, in that case, to return custom data to the client?