Is RHEL Version 8.4. support by Spectrum ?
In the Spectrum documentation the support for RHEL 8 and 8.1 is described.
In Red Hat Enterprise Linux 8, EUS is planned for RHEL 8.1, 8.2, 8.4, 8.6, and 8.8.
Release : 20.2
Component : Spectrum Core / SpectroSERVER
Spectrum on RHEL 8.4 is under testing based on test results will claim support for 21.2.4 or 21.2.6.
Unfortunately its NOT supported on current released versions.
Note : This article is published in September 2021 & if RHEL 8.4 supported in future, article need to be updated.