https://github.com/apache/dubbo/blob/532ce72f8377abf8ff659430b86e0919c9aff562/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/ServiceConfig.java#L240-L248 

What ever user use `instance` service discovery or `interface` service discovery, we also publish service name mapping info. 
But service name mapping need metadata report dependency, so if some one just use `interface` service discovery, the user still need need metadata report dependency.

Here we add a judgement, check current service config use `instance` service discovery or not, to judge publish service name mapping or not.

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 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
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package org.apache.dubbo.config;
import org.apache.dubbo.common.URL;
import org.apache.dubbo.common.URLBuilder;
import org.apache.dubbo.common.Version;
import org.apache.dubbo.common.bytecode.Wrapper;
import org.apache.dubbo.common.extension.ExtensionLoader;
import org.apache.dubbo.common.logger.Logger;
import org.apache.dubbo.common.logger.LoggerFactory;
import org.apache.dubbo.common.url.component.ServiceConfigURL;
import org.apache.dubbo.common.utils.ClassUtils;
import org.apache.dubbo.common.utils.CollectionUtils;
import org.apache.dubbo.common.utils.ConfigUtils;
import org.apache.dubbo.common.utils.NamedThreadFactory;