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