Why don’t all my metrics show up in the metric drop down when I am creating generative attributes in a machine learning model?

Answer:

There are few reasons this could happen, but the most common is that you are trying to build a generative attribute with a calculated metric. You cannot build generative attributes with calculated metrics. Generative attributes must be created with base / table metrics.  Other causes could be data processing issues or join issues. The metric must be joined to the table that the unique identifier came from.