private void handleCancelation(String appName, String id, boolean isReplication) {
		log("cancelled " + appName + ", serverId " + id + ", isReplication " + isReplication);
		publishEvent(new EurekaInstanceCanceledEvent(this, appName, id, 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