The end of the Red Hat security-announcements list

Red Hat has https://listman.redhat.com/archives/rhsa-announce/2023-October/012854.html

that its longstanding "rhsa-announce" mailing list will be shut down on
October 10.  That is the list that receives security advisories for
Red Hat Enterprise Linux and a whole slew of related products.  Anybody who
was counting on that list for Red Hat security advisories will need to find
an alternative; a few options are listed in the announcement.

https://lwn.net/Articles/946851/