Kubernetes service only points to one master in a multi-master cluster

Issue

• Why Does Kubernetes service have only one endpoint in a multi-master cluster?

# oc describe svc kubernetes -n default
Name:              kubernetes
Namespace:         default
Labels:            component=apiserver
                   provider=kubernetes
Annotations:       <none>
Selector:          <none>
Type:              ClusterIP
IP:                10.0.0.1
Port:              https  443/TCP
TargetPort:        8443/TCP
Endpoints:         10.0.0.1:8443
Port:              dns  53/UDP
TargetPort:        8053/UDP
Endpoints:         10.0.0.1:8053
Port:              dns-tcp  53/TCP
TargetPort:        8053/TCP
Endpoints:         10.0.0.1:8053
Session Affinity:  None
Events:            <none>