code: def process_log_record(self, log_record):
          
          log_record["version"] = __version__
          log_record["program"] = PROGRAM_NAME
          log_record["service_name"] = log_record.pop('threadName', None)
          # return jsonlogger.JsonFormatter.process_log_record(self, log_record)
  
          return log_record
docs: Add customer record keys and rename threadName key.