Today we've launched the ability to add custom columns, based on any event field, in any group tab in the Explore view. Depending on the column type, you can now add e.g. min/max/average for numbers and unique value count for strings and enums. In addition to that, you can also see the most recent + top 20 values of the field.
This opens up many new ways of finding suspicious behaviors. For example, basic transaction monitoring by adding columns for count of transaction IDs + total transaction amount per user or device.