docs: protected static void mergeStatusConfig() {
          Map<String, Object> appStatusConfig = Config.getInstance().getJsonMapConfigNoCache(STATUS_CONFIG_NAME[1]);
          if (appStatusConfig == null) {
              return;
          }
          Map<String, Object> statusConfig = Config.getInstance().getJsonMapConfig(STATUS_CONFIG_NAME[0]);
          // clone the default status config key set
          Set<String> duplicatedStatusSet = new HashSet<>(statusConfig.keySet());
          duplicatedStatusSet.retainAll(appStatusConfig.keySet());
          if (!duplicatedStatusSet.isEmpty()) {
              logger.error("The status code(s): " + duplicatedStatusSet.toString() + " is already in use by light-4j and cannot be overwritten," +
                      " please change to another status code in app-status.yml if necessary.");
              throw new RuntimeException("The status code(s): " + duplicatedStatusSet.toString() + " in status.yml and app-status.yml are duplicated.");
          }
          statusConfig.putAll(appStatusConfig);
      }