(DOCSP-9043): operator v1.4.3 release notes (#198)

* (DOCSP-9043): operator v1.4.3 release notes

* (DOCSP-9043): copy review feedback

* (DOCSP-9043): tech review feedback

* (DOCSP-9043): tech review pt 2

* (DOCSP-9043): more tech review feedback

Author: jwilliams-mongo

source/release-notes.txt

@@ -20,6 +20,52 @@ Release Notes for |k8s-op-full|
       Production Notes </reference/production-notes>
       Known Issues </reference/known-issues>
 
+.. _ent-op-1.4.3:
+
+|k8s-op-full| 1.4.3
+-------------------
+
+*Released 2020-02-24*
+
+|k8s-op-short| Changes
+~~~~~~~~~~~~~~~~~~~~~~
+
+Added webhook to validate |k8s-op-short| configuration.
+
+MongoDB Resource Changes
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+- Adds support for sidecars for |k8s-mdbrsc| pods using the 
+  :setting:`spec.podSpec.podTemplate` setting.
+- Allows users to change the ``PodSecurityContext`` to allow privileged 
+  sidecar containers.
+
+|onprem| Resource Changes (Beta Release)
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+- Adds the ``spec.podSpec`` configuration settings for 
+  |onprem|, the Backup Daemon, and the Application Database. See 
+  :ref:`k8s-om-specification`.
+- |onprem| image for version 4.2.8 is available.
+
+Bug Fixes
+~~~~~~~~~
+
+- MongoDB resources:
+
+  - Fixes potential race conditions when deleting |k8s-mdbrscs|.
+
+- |onprem| resources:
+
+  - Supports the :opsmgrkube:`spec.clusterDomain` setting for |onprem|
+    and Application Database resources.
+  - No longer starts monitoring and backup processes for the Application
+    Database.
+
+See the :gh:`sample YAML files
+</mongodb/mongodb-enterprise-kubernetes/tree/master/samples>` for new 
+feature usage examples.
+
 .. _ent-op-1.4.2:
 
 |k8s-op-full| 1.4.2