apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/service/NamespaceBranchService.java/NamespaceBranchService/findBranchGrayRules
class NamespaceBranchService:  public GrayReleaseRuleDTO findBranchGrayRules(String appId, Env env, String clusterName,
                                                String namespaceName, String branchName) {
    return namespaceBranchAPI.findBranchGrayRules(appId, env, clusterName, namespaceName, branchName);

  }