public String getServiceId() {
        if (serviceId == null) {
            serviceId = IDManager.ServiceID.buildId(name, layer.isNormal());
        }
        return serviceId;
    }
Primary key(id), to identify a service with different layers, a service could have more than one layer and be
saved as different records.

@return Base64 encode(serviceName) + "." + layer.value
oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/analysis/manual/service/ServiceTraffic.java