docs: public void notifyCheckpointComplete(long checkpointId, long timestamp) {
  		final LogicalSlot slot = assignedResource;
  
  		if (slot != null) {
  			final TaskManagerGateway taskManagerGateway = slot.getTaskManagerGateway();
  
  			taskManagerGateway.notifyCheckpointComplete(attemptId, getVertex().getJobId(), checkpointId, timestamp);
  		} else {
  			LOG.debug("The execution has no slot assigned. This indicates that the execution is " +
  				"no longer running.");
  		}
  	}