code: private void decrementCounter(Map<String, Boolean> hasExportedInCurrent) {
          //once error, we decrementAndGet the counter
          for (Map.Entry<String, Boolean> entry : hasExportedInCurrent.entrySet()) {
              String protocol = entry.getKey();
              String key = providerConfig.buildKey() + ":" + protocol;
              AtomicInteger cnt = EXPORTED_KEYS.get(key); // 计数器
              if (cnt != null && cnt.get() > 0) {
                  cnt.decrementAndGet();
              }
          }
      }
docs: decrease counter
  
  @param hasExportedInCurrent