In Google Cloud Platform (GCP), a Network Endpoint Group (NEG) is a resource used to represent a group of network endpoints, which can be virtual machine (VM) instances, containers, or IP-port pairs that serve traffic for a specific application. NEGs are especially useful when you want more control over how traffic is routed to your application, as they allow you to create more granular and flexible configurations for load balancing.

The annotation cloud.google.com/neg is specific to Google Kubernetes Engine (GKE) and is used to enable and configure Network Endpoint Groups (NEGs) for services in GKE clusters. This annotation automatically creates and manages NEGs to serve traffic through Google Cloud Load Balancing.

The customer wants a similar feature in the OpenShift 4 cluster running over GCP where the annotation listed below as an example can be added to SVC 

cloud.google.com/neg: '{"exposed_ports": {"80": {"name": "NEG_NAME"}}}'

I found the existing story for the same and Nolan Brubaker informed me to raise an RFE as this request is coming from the customer.

https://issues.redhat.com/browse/OCPCLOUD-2466