Importing a Service like below, will result in 503 on federation ingress or egress gateway (I do not remember), because of missing Envoy cluster for port 15443. Instead, there will be clusters for port 9080 and 443.

apiVersion: v1
kind: Service
metadata: 
  name: details
  labels: 
    app: details
    service: details
spec: 
  ports: 
  - port: 9080
    name: http
  - port: 443
    name: https
  selector: 
    app: details