docs: void reportFailedCheckpoint(long failureTimestamp, @Nullable Throwable cause) {
  		FailedCheckpointStats failed = new FailedCheckpointStats(
  			checkpointId,
  			triggerTimestamp,
  			props,
  			numberOfSubtasks,
  			new HashMap<>(taskStats),
  			currentNumAcknowledgedSubtasks,
  			currentStateSize,
  			currentAlignmentBuffered,
  			failureTimestamp,
  			latestAcknowledgedSubtask,
  			cause);
  
  		trackerCallback.reportFailedCheckpoint(failed);
  	}