Merge "Add the 2023.1 Antelope prelude section"

Author: Zuul

releasenotes/notes/antelope-prelude-4a99907b00e739f8.yaml

@@ -0,0 +1,51 @@
+---
+prelude: |
+    The OpenStack 2023.1 (Nova 27.0.0) release includes many new features and
+    bug fixes. Please be sure to read the upgrade section which describes the
+    required actions to upgrade your cloud from 26.0.0 (Zed) to 27.0.0 (2023.1).
+    As a reminder, OpenStack 2023.1 is our first `Skip-Level-Upgrade Release`__
+    (starting from now, we name it a `SLURP release`) where you can
+    rolling-upgrade your compute services from OpenStack Yoga as an experimental
+    feature. Next SLURP release will be 2024.1.
+
+    .. __: https://governance.openstack.org/tc/resolutions/20220210-release-cadence-adjustment.html
+
+    There are a few major changes worth mentioning. This is not an exhaustive
+    list:
+
+    - The latest Compute API microversion supported for 2023.1 is `v2.95`__.
+
+      .. __: https://docs.openstack.org/nova/latest/reference/api-microversion-history.html#maximum-in-2023.1
+
+    - `PCI devices can now be scheduled <https://docs.openstack.org/nova/latest/admin/pci-passthrough.html#pci-tracking-in-placement>`_
+      by Nova using the Placement API on a opt-in basis. This will help the
+      nova-scheduler service to better schedule flavors that use PCI
+      (non-Neutron related) resources, will generate less reschedules if an
+      instance cannot be created on a candidate and will help the nova-scheduler
+      to not miss valid candidates if the list was too large.
+
+    - Operators can now ask Nova to `manage the power consumption of dedicated
+      CPUs <https://docs.openstack.org/nova/latest/admin/cpu-topologies.html#configuring-cpu-power-management-for-dedicated-cores>`_
+      so as to either offline them or change their governor if they're
+      currently not in use by any instance or if the instance is stopped.
+
+    - Nova will prevent unexpected compute service renames by `persisting a unique
+      compute UUID on local disk <https://docs.openstack.org/nova/latest/admin/compute-node-identification.html>`_.
+      This stored UUID will be considered the source of truth for knowing whether
+      the compute service hostame has been modified or not. As a reminder,
+      changing a compute hostname is forbidden, particularly when this compute is
+      currently running instances on top of it.
+
+    - `SPICE consoles <https://docs.openstack.org/nova/latest/admin/remote-console-access.html#spice-console>`_
+      can now be configured with compression settings which include choices of the
+      compression algorithm and the compression mode.
+
+    - Fully-Qualified Domain Names are now considered valid for an instance
+      hostname if you use the 2.94 API microversion.
+
+    - By opting into 2.95 API microversion, evacuated instances will remain
+      stopped on the destination host until manually started.
+
+    - Nova APIs now `by default support new RBAC policies <https://docs.openstack.org/nova/latest/configuration/policy.html>`
+      and scopes. See our `Policy Concepts documention <https://docs.openstack.org/nova/latest/configuration/policy-concepts.html>`
+      for further details.