A family of System Center products that provide infrastructure monitoring, help ensure the predictable performance and availability of vital applications, and offer comprehensive monitoring for datacenters and cloud, both private and public.
RHEL8 is supported starting with SCOM 2019 UR1 : https://learn.microsoft.com/en-us/system-center/scom/plan-supported-crossplat-os?view=sc-om-2019#red-hat-enterprise-linux-server-8-applicable-for-2019-ur1-and-later
SCOM 2019 requires at least Windows 2016 : https://learn.microsoft.com/en-us/system-center/scom/system-requirements?view=sc-om-2019#server-operating-system