code: def add_execution_event(self, context_id, event):
          
          if context_id not in self._contexts:
              LOGGER.warning("Context_id not in contexts, %s", context_id)
              return False
  
          context = self._contexts.get(context_id)
          context.add_execution_event(event)
          return True
docs: Within a context, append data to the execution result.
  
          Args:
              context_id (str): the context id returned by create_context
              data_type (str): type of data to append
              data (bytes): data to append
  
          Returns:
              (bool): True if the operation is successful, False if
                  the context_id doesn't reference a known context.