Alerts about high maximum concurrent workers (requests) in percentage based on the limit of the database's service tier.
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