@Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        ServiceCluster that = (ServiceCluster) o;
        return Objects.equals(clusterId, that.clusterId) &&
                Objects.equals(serviceType, that.serviceType) &&
                Objects.equals(serviceInstances, that.serviceInstances);
    }
Is a config server (and not controller!)
application-model/src/main/java/com/yahoo/vespa/applicationmodel/ServiceCluster.java