Foglight Agent Manager is being spammed with this message being written hundreds of times per second in the FglAM log when monitoring SQL Server 2017 (14.0.1000.169) at the base RTM release with no critical updates applied.
Deactivate the SQL Server Agent Error Log collection.
Change the driver from Microsoft to Data Direct as described in KB 338210.
For some systems, applying the most recent critical updates to SQL Server helped to stop these messages from appearing. This however has not been a consistent resolution.
Defect ID FOG-3979 has been logged for this message to be hidden from logging in a future release of the SQL Server cartridge.