@Bean
	@ConditionalOnMissingBean
	@Conditional(NacosDiscoveryHeartBeatCondition.class)
	public NacosDiscoveryHeartBeatPublisher nacosDiscoveryHeartBeatPublisher(NacosDiscoveryProperties nacosDiscoveryProperties) {
		return new NacosDiscoveryHeartBeatPublisher(nacosDiscoveryProperties);
	}
Nacos HeartBeat is no longer enabled by default .
publish an event every 30 seconds
see https://github.com/alibaba/spring-cloud-alibaba/issues/2868
see https://github.com/alibaba/spring-cloud-alibaba/issues/3258
spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-discovery/src/main/java/com/alibaba/cloud/nacos/discovery/NacosDiscoveryHeartBeatConfiguration.java