code: void updateSummary(CompletedCheckpointStats completed) {
  		stateSize.add(completed.getStateSize());
  		duration.add(completed.getEndToEndDuration());
  		alignmentBuffered.add(completed.getAlignmentBuffered());
  	}
docs: Updates the summary with the given completed checkpoint.
  
  @param completed Completed checkpoint to update the summary with.