Tidy up release notes for Flamingo release21.0.0.0rc1

Change-Id: I10f47d3454fd81a36aa7a724050869ef680e88b4
Signed-off-by: Bartosz Bezak <bartosz@stackhpc.com>

11 files changed, 47 insertions, 26 deletions

diff --git a/releasenotes/notes/deprecate-collectd-8ba94052bdc9424b.yaml b/releasenotes/notes/deprecate-collectd-8ba94052bdc9424b.yaml
deleted file mode 100644
index c41b720f9..000000000
--- a/releasenotes/notes/deprecate-collectd-8ba94052bdc9424b.yaml
+++ /dev/null
@@ -1,4 +0,0 @@
----
-deprecations:
-  - |
-    Deprecates support for building ``collectd`` images.
diff --git a/releasenotes/notes/deprecate-telegraf-db2b0b9f30591552.yaml b/releasenotes/notes/deprecate-telegraf-db2b0b9f30591552.yaml
index 7aa96baff..0667f571d 100644
--- a/releasenotes/notes/deprecate-telegraf-db2b0b9f30591552.yaml
+++ b/releasenotes/notes/deprecate-telegraf-db2b0b9f30591552.yaml
@@ -1,4 +1,4 @@
 ---
 deprecations:
   - |
-    Deprecates support for building ``telegraf`` images.
+    Deprecates support for building ``collectd`` and ``telegraf`` images.
diff --git a/releasenotes/notes/drop-venus-435234b3bff7f209.yaml b/releasenotes/notes/drop-venus-435234b3bff7f209.yaml
index 879e494a0..b6d221842 100644
--- a/releasenotes/notes/drop-venus-435234b3bff7f209.yaml
+++ b/releasenotes/notes/drop-venus-435234b3bff7f209.yaml
@@ -1,5 +1,5 @@
 ---
 upgrade:
   - |
-    Support for building ``Venus`` container images has been dropped,
-    following it's inactivity and producing breaking Horizon plugin builds.
+    Support for building ``Venus`` container images has been dropped due to the
+    project's inactivity and the Horizon plugin build failures it caused.
diff --git a/releasenotes/notes/flamingo-prelude-b72f2599ed9d25d5.yaml b/releasenotes/notes/flamingo-prelude-b72f2599ed9d25d5.yaml
new file mode 100644
index 000000000..c0b40675a
--- /dev/null
+++ b/releasenotes/notes/flamingo-prelude-b72f2599ed9d25d5.yaml
@@ -0,0 +1,24 @@
+---
+prelude: |
+  The Kolla ``21.0.0`` (Flamingo) release modernises the base operating
+  systems and core infrastructure shipped by the containers. Highlights
+  include:
+
+  * Rocky Linux 10 replaces Rocky Linux 9 as the only supported Rocky base
+    image, removing the Delorean/CentOS Cloud SIG dependency and tightening RPM
+    repository handling via ``repos.yaml`` (including a new versioned Erlang
+    source for aarch64).
+  * Data-plane services received major upgrades: ``MariaDB`` now tracks the
+    11.4 LTS series with the upstream health check script and the legacy
+    clustercheck image removed, ``ProxySQL`` moves to 3.x, ``Bifrost`` consumes
+    Ansible 11, ``RabbitMQ`` advances to 4.1, and ``Gnocchi`` is updated to
+    4.7.0.
+  * Observability components were refreshed with ``Fluentd`` 6.x LTS,
+    ``OpenSearch``/``OpenSearch Dashboards`` 3.x, broad ``Prometheus`` exporter
+    and infrastructure bumps (``etcd``, ``helm``, ``letsencrypt-lego``), and the
+    retirement of the ``collectd``, ``telegraf``, and ``prometheus-ovn-exporter``
+    images.
+  * The container portfolio was streamlined: support landed for the
+    ``ironic-pxe-filter`` image and ``neutron-metadata-agent`` wrapper scripts,
+    while dormant services such as ``ironic-inspector`` and ``Venus`` were
+    dropped.
diff --git a/releasenotes/notes/fluentd-update-8db10e760b2dc4d5.yaml b/releasenotes/notes/fluentd-update-8db10e760b2dc4d5.yaml
index 6ecb744c0..7ac12764b 100644
--- a/releasenotes/notes/fluentd-update-8db10e760b2dc4d5.yaml
+++ b/releasenotes/notes/fluentd-update-8db10e760b2dc4d5.yaml
@@ -1,4 +1,4 @@
 ---
 upgrade:
   - |
-    Update Fluentd to version 6.x LTS.
+    Updates ``Fluentd`` to the 6.x LTS series.
diff --git a/releasenotes/notes/mariadb-11.4-b66b5baf9f5e6cd0.yaml b/releasenotes/notes/mariadb-11.4-b66b5baf9f5e6cd0.yaml
index 17c0f9845..9fa74e899 100644
--- a/releasenotes/notes/mariadb-11.4-b66b5baf9f5e6cd0.yaml
+++ b/releasenotes/notes/mariadb-11.4-b66b5baf9f5e6cd0.yaml
@@ -1,5 +1,5 @@
 ---
-features:
+upgrade:
   - |
-    ``MariaDB`` version has been updated to ``11.4 LTS``.
-    This version will be supported until 29th May 2029.
+    Updates ``MariaDB`` to the ``11.4`` LTS release, which is supported until
+    29 May 2029.
diff --git a/releasenotes/notes/opensearch-upgrade-9e263a65f015a376.yaml b/releasenotes/notes/opensearch-upgrade-9e263a65f015a376.yaml
index d7e00e331..9c3f5a300 100644
--- a/releasenotes/notes/opensearch-upgrade-9e263a65f015a376.yaml
+++ b/releasenotes/notes/opensearch-upgrade-9e263a65f015a376.yaml
@@ -1,4 +1,4 @@
 ---
 upgrade:
   - |
-    Update OpenSearch and OpenSearch Dashboards to version 3.x.
+    Updates ``OpenSearch`` and ``OpenSearch Dashboards`` to version 3.x.
diff --git a/releasenotes/notes/rabbitmq-41-d881d0b6bbf46446.yaml b/releasenotes/notes/rabbitmq-41-d881d0b6bbf46446.yaml
index 8046fc722..2456bcf66 100644
--- a/releasenotes/notes/rabbitmq-41-d881d0b6bbf46446.yaml
+++ b/releasenotes/notes/rabbitmq-41-d881d0b6bbf46446.yaml
@@ -1,4 +1,4 @@
 ---
 upgrade:
   - |
-    ``rabbitmq`` version has been updated to ``4.1``.
+    Updates ``RabbitMQ`` to version ``4.1``.
diff --git a/releasenotes/notes/remove-prometheus-ovn-exporter-c5f5005b4d1a4b12.yaml b/releasenotes/notes/remove-prometheus-ovn-exporter-c5f5005b4d1a4b12.yaml
index 6bac39901..04382375e 100644
--- a/releasenotes/notes/remove-prometheus-ovn-exporter-c5f5005b4d1a4b12.yaml
+++ b/releasenotes/notes/remove-prometheus-ovn-exporter-c5f5005b4d1a4b12.yaml
@@ -1,5 +1,5 @@
 ---
-deprecations:
+upgrade:
   - |
-    The OVN exporter has been removed with immediate effect since 1) it isn't
-    used in Kolla Ansible and 2) the source repo was archived in Dec 2024.
+    Removes the ``prometheus-ovn-exporter`` image because it is unused by
+    Kolla Ansible and the upstream repository was archived in December 2024.
diff --git a/releasenotes/notes/rocky-10-4111fa0160be14ab.yaml b/releasenotes/notes/rocky-10-4111fa0160be14ab.yaml
index 2fccba796..98ef21f28 100644
--- a/releasenotes/notes/rocky-10-4111fa0160be14ab.yaml
+++ b/releasenotes/notes/rocky-10-4111fa0160be14ab.yaml
@@ -1,12 +1,12 @@
 ---
 features:
   - |
-    Adds support for Rocky 10 as a base container image. This is the only major
-    version of Rocky supported from the 2025.2 release.
+    Adds support for Rocky Linux 10 as a base container image. From the 2025.2
+    release onward, Rocky Linux 10 is the only supported Rocky Linux major version.
 upgrade:
   - |
-    Rocky 9 is no longer supported as a base container image. Rocky users
-    should migrate to Rocky 10.
+    Rocky Linux 9 is no longer supported as a base container image, so
+    deployments using Rocky Linux should migrate to Rocky Linux 10.
   - |
-    The following images were supported by Rocky 9 but lack suitable packages
-    in Rocky, and are no longer supported for Rocky: ``telegraf``.
+    The ``telegraf`` image relied on Rocky Linux 9-only packages and is therefore
+    unavailable for Rocky Linux-based builds.
diff --git a/releasenotes/notes/update-packages-071d1863639fe3e3.yaml b/releasenotes/notes/update-packages-071d1863639fe3e3.yaml
index d8d48ad3f..efe10a960 100644
--- a/releasenotes/notes/update-packages-071d1863639fe3e3.yaml
+++ b/releasenotes/notes/update-packages-071d1863639fe3e3.yaml
@@ -1,8 +1,9 @@
 ---
 upgrade:
   - |
-    Update monitoring and key infrastructure components to their latest versions.
-    This upgrade includes several prometheus-related services, as well as Etcd and Lego.
+    Updates monitoring and key infrastructure components to their latest
+    supported versions. This covers several Prometheus exporters as well as
+    ``etcd``, ``helm``, and ``letsencrypt-lego``.
 
     * etcd: 3.5.16 -> 3.6.5
     * helm: 3.16.3 -> 3.19.0
@@ -15,5 +16,5 @@ upgrade:
     * prometheus-node-exporter: 1.8.2 -> 1.9.1
     * prometheus-server: 3.2.1 -> 3.5.0 (LTS)
 
-    Additionally, Prometheus-server has been switched to its Long-Term Support (LTS)
-    version to ensure greater stability and extended support.
+    Additionally, ``prometheus-server`` now tracks the Long-Term Support (LTS)
+    channel to provide longer maintenance windows.