docs: public static BizLogger getLogger(Level level, RemotingClientDelegate remotingClient, TaskTrackerAppContext appContext) {
  
          // 单元测试的时候返回 Mock
          if (Environment.UNIT_TEST == LTSConfig.getEnvironment()) {
              return new MockBizLogger(level);
          }
  
          String key = appContext.getConfig().getIdentity();
          BizLogger logger = BIZ_LOGGER_CONCURRENT_HASH_MAP.get(key);
          if (logger == null) {
              synchronized (BIZ_LOGGER_CONCURRENT_HASH_MAP) {
                  logger = BIZ_LOGGER_CONCURRENT_HASH_MAP.get(key);
                  if (logger != null) {
                      return logger;
                  }
                  logger = new BizLoggerImpl(level, remotingClient, appContext);
  
                  BIZ_LOGGER_CONCURRENT_HASH_MAP.put(key, logger);
              }
          }
          return logger;
      }