A previous feature suggestion, https://sqlmonitor.uservoice.com/forums/91743-suggestions/suggestions/11122308-forecast-and-plan-disk-database-capacity, was completed in 2018. However, it does not include storage for Azure SQL Databases or Elastic Pools. While we can alert on this, we get no trend analysis or forecasting.

Selecting All Disks and All Groups on the Estate | Disk usage page gets us "No disks match your filter criteria."