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---
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.
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