All maintenance logs (created by technicians) and maintenance log files (created automatically by the industrial equipment) are loaded into the data lake of a large company that provides services for industrial equipment for later evaluation. Later, the most error-prone machines should be evaluated in this way, e.g. patterns in downtime should be recognized. For the planned analysis, explain what role metadata plays at the individual levels of the data lake. In your answer, refer to the specific example given here.