Hello
If you want to have a ro account from Grafana or for Centralization, you have to grant execute on the SQLWatch DB.
This can be done using the following SQLu
use SQLWATCH
GO
CREATE ROLE db_execute;
GO
GRANT EXECUTE TO db_execute;
GO
Then add this role plus db_datareader to your account.
As I am not a SQL guy - I am sysadmin , I hope this will help people like me
Best regards