🧩 Aggregating a dimension on a viz now creates a metric

We've made aggregation on a viz more reusable.

Before: aggregating a dimension on a viz only created a setting on that viz field. It couldn't be reused in filters or in other metrics.

Now: that aggregation creates a new metric, or reuses a matching one from the dataset. This metric can be used in filters, derived metrics, etc.

This is available for Holistics 4.0. We'd love to hear if you have any feedback on this update.