Release: All Supported Releases
Component : SPCINS - Spectrum Installation
RHEL 8.4 is supported for Spectrum 21.2.x.
Below is a link to the documentation that outlines the supported operating systems.
https://techdocs.broadcom.com/us/en/ca-enterprise-software/it-operations-management/spectrum/21-2/installing-and-upgrading/fresh-install/system-requirements-for-installing-ca-spectrum/spectroserver-and-oneclick-requirements/system-requirements-for-linux.html