code: public Map<String, Object> getDebugInfo()
    {
      Preconditions.checkArgument(lifecycleLock.awaitStarted(1, TimeUnit.MILLISECONDS));
  
      Map<String, Object> result = new HashMap<>(servers.size());
      for (Map.Entry<String, DruidServerHolder> e : servers.entrySet()) {
        DruidServerHolder serverHolder = e.getValue();
        result.put(
            e.getKey(),
            serverHolder.syncer.getDebugInfo()
        );
      }
      return result;
    }
docs: This method returns the debugging information exposed by {@link HttpServerInventoryViewResource} and meant
  for that use only. It must not be used for any other purpose.