A bus-fleet model currently sees only the latest odometer reading. Maintainers want to add minutes-since-last-brake-job, derived from raw shop timestamps, before the next training run. They are not asking anyone to set a learning rate. Which lifecycle step is this?
Select an answer to reveal the explanation.
Short Explanation
Think of turning raw shop timestamps into minutes-since-last-brake-job before the next training run. That is feature engineering, a prepare-the-data step. It is not a go-live, not a learning-rate knob, and not watching last week's boardings.
Full Explanation
Feature engineering creates useful input variables from raw fields, which is a prepare-the-data step before the next training run. Adding a derived column is not by itself a production deploy. Learning-rate tuning is a training-time hyperparameter choice, which the team did not ask for. Monitoring live boardings is a later operations step, not the creation of the input.