Alerts about the maximum concurrent workers (requests) in percentage based on the limit of the database's service tier.
Maximum is currently calculated for the five-minute interval based on the 15-second samples of concurrent worker counts.
This condition can only work when connecting to the "master" database in your Azure SQL Server.
NOTE:
When a database is a member of an elastic pool, resource statistics presented as percent values, are expressed as the percent of the max limit for the databases as set in the elastic pool configuration.
For more info:
https://docs.microsoft.com/en-us/sql/relational-databases/system-catalog-views/sys-resource-stats-azure-sql-database