Add 3.4.0-rc.8 release notes

source/releasenotes/3.4.0-rc.8.rst

+3.4.0-rc.8 (2024-08-26)
+=======================
+
+Changes
+-------
+
+The main changes are:
+
+- 'metrics' service: avoid unecessary long shutdown
+
+- http webhook: implement handling of temporary errors when posting messages
+  individually.
+
+Documentation
+-------------
+
+Documentation is online:
+
+  https://docs.xbus.io/
+
+Downloads
+---------
+
+Source and binaries are available on our download area:
+
+- https://dl.xbus.io/xbus/src/xbus-3.4.0-rc.8-src.tar.xz
+
+version "personal":
+
+- https://dl.xbus.io/xbus/personal/xbus-3.4.0-rc.8-linux_amd64.tar.xz
+- https://dl.xbus.io/xbus/personal/xbus-3.4.0-rc.8-windows_amd64.tar.xz
+- https://dl.xbus.io/xbus/personal/xbus-3.4.0-rc.8-darwin_amd64.tar.xz
+
+Docker images
+-------------
+
+Get the docker images:
+
+version "personal":
+
+  - orus/xbusd:3.4.0-rc.8
+  - orus/xbusctl:3.4.0-rc.8
+  - orus/xbus-client:3.4.0-rc.8
+  - orus/xbus-http:3.4.0-rc.8
+  - orus/xbus-fullenv:3.4.0-rc.8

source/releasenotes/index.rst

@@ -4,6 +4,8 @@
 =============
 
 .. toctree::
+   3.4.0-rc.8
+   3.4.0-rc.7
    3.4.0-rc.6
    3.4.0-rc.5
    3.4.0-rc.4