private void handleRegistration(InstanceInfo info, int leaseDuration, boolean isReplication) {
		log("registered " + info.getAppName() + ", vip " + info.getVIPAddress() + ", leaseDuration " + leaseDuration
				+ ", isReplication " + isReplication);
		publishEvent(new EurekaInstanceRegisteredEvent(this, info, leaseDuration, isReplication));
	}
If
{@link PeerAwareInstanceRegistryImpl#openForTraffic(ApplicationInfoManager, int)}
is called with a zero argument, it means that leases are not automatically
cancelled if the instance hasn't sent any renewals recently. This happens for a
standalone server. It seems like a bad default, so we set it to the smallest
non-zero value we can, so that any instances that subsequently register can bump up
the threshold.
spring-cloud-netflix-eureka-server/src/main/java/org/springframework/cloud/netflix/eureka/server/InstanceRegistry.java