Low Memory Alert Detected

This warning has been raised because SQL Server has recently flagged a low memory alert. This is simply an indicator that SQL Server has been constrained by memory availability.

Suggested Action

Review memory usage, grants, and explore the possibility of increasing the available memory.

How to Check for Memory Utilization and Memory Low Alerts in SQL Server

SELECT
   memory_utilization_percentage AS sql_memory_utilization_percentage,
   process_physical_memory_low AS sql_process_physical_memory_low, 
   process_virtual_memory_low AS sql_process_virtual_memory_low
FROM sys.dm_os_process_memory;  

Further Reading

Server memory configuration options | Microsoft Docs