apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/repository/GrayReleaseRuleRepository.java/GrayReleaseRuleRepository/findByAppIdAndClusterNameAndNamespaceName
class GrayReleaseRuleRepository:  List<GrayReleaseRule> findByAppIdAndClusterNameAndNamespaceName(String appId,
                                                               String clusterName, String namespaceName);