`@ConditionalOnProperty` target property with no metadata

Several auto-configurations use a condition on a property that has no metadata. As a result, trying to use it to customize the auto-configuration lead to a warning in an IDE.

The report detected the following:

org.springframework.cloud.zookeeper.config.ZookeeperConfigAutoConfiguration [spring.cloud.zookeeper.config.enabled]
org.springframework.cloud.zookeeper.config.ZookeeperConfigAutoConfiguration.ZkRefreshConfiguration#configWatcher [spring.cloud.zookeeper.config.watcher.enabled]
org.springframework.cloud.zookeeper.discovery.ConditionalOnRibbonZookeeper [ribbon.zookeeper.enabled]
org.springframework.cloud.zookeeper.discovery.ZookeeperRibbonClientConfiguration#dependenciesBasedLoadBalancer [spring.cloud.zookeeper.dependency.ribbon.loadbalancer]
org.springframework.cloud.zookeeper.discovery.dependency.DependencyFeignClientAutoConfiguration [spring.cloud.zookeeper.dependency.headers.enabled]
org.springframework.cloud.zookeeper.discovery.dependency.DependencyRestTemplateAutoConfiguration [spring.cloud.zookeeper.dependency.resttemplate.enabled]
org.springframework.cloud.zookeeper.discovery.dependency.DependencyRibbonAutoConfiguration#loadBalancerClient [spring.cloud.zookeeper.dependency.ribbon.enabled]
org.springframework.cloud.zookeeper.serviceregistry.ZookeeperServiceRegistryAutoConfiguration [spring.cloud.service-registry.enabled]

Start by locating the listed auto-configuration classes and their @ConditionalOnProperty declarations, then inspect how configuration metadata is generated for this project. Verify that each reported property has metadata and that the IDE warnings no longer appear for the listed conditions.