private void resetIfNeeded(Instance instance) {
		if (!properties.getMetadata().equals(instance.getMetadata())) {
			properties.setMetadata(instance.getMetadata());
		}
	}
@author xiaojing
@author yuhuangbin
@author pengfei.lu
@author ruansheng
spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-discovery/src/main/java/com/alibaba/cloud/nacos/discovery/NacosWatch.java