Based on the SQL Server 126.96.36.199 Release Notes, SSFOG-879 was resolved under the section of "Resolved issues and enhancements":
-Fixed a "Numeric Overflow" error found in the agent log during "DBSS_Sessions" collections.
However customer still encountered the same error after upgrading to SQL Server cartridge 188.8.131.52.
As the result, it triggered the following alarm below:
Alarm: DBSS - Collection Status (alarm group: Agent_Availability)
Message: Collection Status. DBSS_Sessions Failed with the exception: Failed to execute collection [DBSS_Sessions], reason=[Foglight][SQLServer JDBC Driver]Numeric overflow.
Created on: Thu Feb 21 15:44:37 CST 2019