@Override
    public Class[] services() {
        return new Class[] {DynamicConfigurationService.class};
    }
Configuration Module sync the settings from remote service, the remote service could be implemented by this module
provider.
<p>
Any configuration item in the whole OAP backend could register a watcher to configuration module, the item change
watcher will be called, if the value changed.
oap-server/server-configuration/configuration-api/src/main/java/org/apache/skywalking/oap/server/configuration/api/ConfigurationModule.java