@Override
    public void notifyAfterCompleted() throws ServiceNotProvidedException, ModuleStartException {
        configWatcherRegister.start();
    }
The recommendation default base implementor of Configuration module. The real implementor could extend this provider
to make a new one, easily.
oap-server/server-configuration/configuration-api/src/main/java/org/apache/skywalking/oap/server/configuration/api/AbstractConfigurationProvider.java