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.

} catch (ClassNotFoundException e) {
                throw new IllegalStateException(e.getMessage(), e);
            }
            
            checkRef();
            generic = Boolean.FALSE.toString();
        }
        if (local != null) {
            if ("true".equals(local)) {
                local = interfaceName + "Local";
            }
            Class<?> localClass;
            try {
                localClass = ClassUtils.forNameWithThreadContextClassLoader(local);
            } catch (ClassNotFoundException e) {
                throw new IllegalStateException(e.getMessage(), e);
            }
            if (!interfaceClass.isAssignableFrom(localClass)) {
                throw new IllegalStateException("The local implementation class " + localClass.getName() + " not implement interface " + interfaceName);
            }
        }
        if (stub != null) {
            if ("true".equals(stub)) {
                stub = interfaceName + "Stub";
            }
            Class<?> stubClass;
            try {
                stubClass = ClassUtils.forNameWithThreadContextClassLoader(stub);
            } catch (ClassNotFoundException e) {
                throw new IllegalStateException(e.getMessage(), e);