code: def _hold_block(self, block_id):
          
  
          managers = self.connected_managers
  
          for manager in managers:
              if manager['block_id'] == block_id:
                  logger.debug("[HOLD_BLOCK]: Sending hold to manager:{}".format(manager['manager']))
                  self.hold_worker(manager['manager'])
docs: Sends hold command to all managers which are in a specific block
  
          Parameters
          ----------
          block_id : str
               Block identifier of the block to be put on hold