A new update of Qualys Gateway Service is going to be released into production on Qualys US Platform 2 on September 17th.
After the QGS deployment, QGS O.S would be updated to flatcar O.S. Please whitelist update.release.flatcar-linux.net for QGS appliance to get this update as documented in https://www.qualys.com/docs/qualys-gateway-service-user-guide.pdf
and after the flatcar O.S update, QGS appliance would reboot once.
Ticket Reference for this activity: CMB-81015.