Buffer Pool scan took 10 seconds error Using SQL server 2017 (14.0.3381.3) with Always On High Availability environment.
Getting error:&quot;Buffer Pool scan took 10 seconds: database ID 8, command 'CHECKPOINT', operation 'FlushCache', scanned buffers 144321190, total iterated buffers 150079215, wait time 42 ms. See 'https://go.microsoft.com/fwlink/?linkid=2132602' for more information&quot;
This is a new feature that is included in the 2017 CU23, under the VSTS bug number 13741858.
I see the list of all the operations that can trigger a scan but none of them are happening on my machine, is there a way to tell what causes the scan? - OR -  Is there a Trace Flag that can be used to turn  off the log of this error?
I see the list of all the operations that can trigger a scan but none of them are happening on my machine, is there a way to tell what causes the scan?

It's a CHECKPOINT on database ID 8.  It says so right in the message.
Do you have INDIRECT CHECKPOINT enabled?  What does
select database_id , name, target_recovery_time_in_seconds
from sys.databases
where database_id = 8

return?  The default of 60 enables indirect checkpoints.