Alerts about high utilization for In-Memory OLTP in percentage of the limit of the service tier (at the end of the reporting interval).
This includes memory used for storage of the following In-Memory OLTP objects: memory-optimized tables, indexes, and table variables.
It also includes memory used for processing ALTER TABLE operations.
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: