Add Katello 4.16 release notes

guides/doc-Release_Notes/topics/katello-contributors.adoc

@@ -0,0 +1,25 @@
+Maria Agaphontzev <mariaaga@redhat.com>
+Partha Aji <paji@redhat.com>
+Ian Ballou <ianballou67@gmail.com>
+Lucas Bickel <lucas[email protected]>
+Markus Bucher <bucher@atix.de>
+Thorben Denzer <denzer@atix.de>
+Oleh Fedorenko <ofedoren@redhat.com>
+Lucy Fu <lufu@redhat.com>
+Evgeni Golov <evgeni@golov.de>
+Nadja Heitmann <nadjah@atix.de>
+Ashish Humbe <ahumbe@redhat.com>
+Quinn James <qj@quinnjam.es>
+Samir Jha <samirjha1525@gmail.com>
+Archana Kumari <akumari@redhat.com>
+Adam Lazik <alazik@redhat.com>
+Jeremy Lenz <jlenz@redhat.com>
+Pavel Moravec <pmoravec@redhat.com>
+Quirin Pamp <pamp@atix.de>
+Chris Roberts <chrobert@redhat.com>
+Adam Ruzicka <aruzicka@redhat.com>
+Pavan Soma Shekar <shekarpavan97@gmail.com>
+Leos Stejskal <github@stejskalleos.cz>
+Bernhard Suttner <suttner@atix.de>
+Ewoud Kohl van Wijngaarden <ewoud@kohlvanwijngaarden.nl>
+Hao Chang Yu <hyu@redhat.com>

guides/doc-Release_Notes/topics/katello.adoc

@@ -4,12 +4,58 @@
 [id="katello-headline-features"]
 == Headline Features
 
+=== Image-mode host support
+
+Katello has added a new type of host: image-mode hosts.
+Image-mode hosts are standard hosts configured to run a bootc bootable container image at startup.
+Katello 4.16 allows users to assign bootable container images to an image-mode host to easily deploy identical system configurations, from basic to complex.
+
+Existing hosts are now considered 'package-mode hosts' and will exist alongside the new host type.
+Both host types can be set up and configured using existing host management processes.
+
+Bootable container images (bootc images) can be managed similarly to existing Foreman repositories.
+A new 'Booted container images' page displays all bootc images and their respective host counts.
+These images are available via API at '/hosts/bootc_images'.
+
+
+=== Flatpak content support
+
+Katello now supports Flatpak content.
+Flatpak content can be manually added as a local repository or can be imported from external sources as a Flatpak remote repository.
+After import, Flatpak remote repositories can be mirrored to local Katello repositories via remote repository mirroring.
+Flatpak repositories (local or remote) can be easily installed and synced on remote hosts via any of Katello's existing repository management techniques.
+Flatpak remote repositories are available via API at `/flatpak_remotes`.
+
+
+=== 'Sync Dependencies' option for Ansible collection repositories.
+
+Ansible collection repositories now have a new option: 'Sync Dependencies'.
+When enabled (default), Pulp will sync the collections given in the requirements file and their dependencies.
+When disabled, Pulp will only sync the collections, without their dependencies.
+
+
+=== Organization custom labels
+
+Organizations now support the ability to use user-submitted labels during creation.
+
+
+=== Allow for non-standard errata types in errata filters
+
+Errata filtering by type now supports an additional 'other' option, letting users filter by errata types which don't match the standard 'Bugfix', 'Enhancement', or 'Security' types.
+
+
 === postgresql-evr extension no longer required
 
 Installation of the Katello database on remote systems where root access is not available is now possible.
 Only a basic PostgreSQL installation is required.
 With this feature, you can now install on systems like Amazon RDS or Azure Database for PostgreSQL.
 
+
+=== Rails 7.0 support
+
+Katello has been updated to support Rails 7.0.
+
+
 [id="katello-upgrade-warnings"]
 == Upgrade Warnings