What is the use of apigee-ingressgateway-manager-* pods in Apigee Hybrid?

As we know apigee-ingress-* pods are responsible for handling incoming API traffic, I would like to know what the apigee-ingressgateway-manager-* pods in apigee namespace are for, in Apigee Hybrid. 

Thank you for your time

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In simpler terms, the apigee-ingressgateway-manager pods handle keeping the traffic directions (routing) up-to-date for Apigee Ingress.
This is important because these directions can change on the fly, like when a user adds a new environment.