How to Measure a Model's Drift?

There are lots of reasons why companies can't just retrain their model every day, but that doesn't mean we just give up hope. If we acknowledge our models could have drift, and we'd like to get some indicator if drift has curred, maybe it's worth investing the cost of retraining the model. Yellus: "I think at thik is very able to measure something for a long time, particularly collect various model metrics"