每次应用重启，都会在 /dubbo/metadata/${appName} 下生成一个版本号。经过调试，发现在每次计算 revison， 会连同  pid 和 timestamp 一起计算。这样是不是有问题呢？

![image](https://user-images.githubusercontent.com/24663965/125059185-a1178700-e0dd-11eb-8271-0243d59d30b6.png)

private static ExtensionLoader<MetadataParamsFilter> loader = ExtensionLoader.getExtensionLoader(MetadataParamsFilter.class);
        private String name;
        private String group;
        private String version;
        private String protocol;
        private String path; 
        private Map<String, String> params;
        
        private transient Map<String, String> consumerParams;
        
        private transient Map<String, Map<String, String>> methodParams;
        private transient Map<String, Map<String, String>> consumerMethodParams;
        
        private transient Map<String, Number> numbers;
        private transient Map<String, Map<String, Number>> methodNumbers;