[21244] Include v2.6.9 release notes and 2.6.x maintenance flag (backport #848)

docs/notes/notes.rst

@@ -103,6 +103,7 @@ Previous versions
 .. include:: previous_versions/v2.7.2.rst
 .. include:: previous_versions/v2.7.1.rst
 .. include:: previous_versions/v2.7.0.rst
+.. include:: previous_versions/v2.6.9.rst
 .. include:: previous_versions/v2.6.8.rst
 .. include:: previous_versions/v2.6.7.rst
 .. include:: previous_versions/v2.6.6.rst

docs/notes/previous_versions/v2.6.9.rst

@@ -0,0 +1,55 @@
+Version 2.6.9 (maintenance)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. important::
+  According to our
+  `release support guidelines <https://github.com/eProsima/Fast-DDS/blob/master/RELEASE_SUPPORT.md>`_
+  Fast DDS v2.6.9 will be the last patch version receiving backported features and bugfixes.
+  From now on, the v2.6 minor will only receive patches for critical issues and security fixes.
+
+This release includes the following **features**:
+
+#. Add XML configuration for FlowControllerDescriptor to 2.x
+#. New ``max_message_size`` property to limit output datagrams size
+
+This release includes the following **improvements**:
+
+#. Update Fast CDR thirdparty submodule
+#. Consider library behavior changes as ABI breaks in the PR template checklist
+#. Allow processing of AckNack submessages with count == 0
+#. Use ``%*`` instead of loop in ``.bat`` scripts.
+#. Use absolute paths when loading XML files
+#. TCPSendResources cleanup
+
+Github CI management:
+
+#. Fix Python Installation version in Github CI. Address failing system tests environment issues
+#. Set fallback branch for ``get_related_branch_from_repo`` correctly
+#. Fix sanitizers CI test summary report
+#. Protect asio exception
+#. Set Fallback branch to 2.6.x
+#. Run selected VS tool on Windows CI
+#. Add DNS entries to hosts files on Github workflows
+#. Refactor Fast DDS Ubuntu CI to include several tests
+#. Avoid ``CCache`` in workflows and nighties
+#. Update README.md with GitHub actions Ubuntu CI nightly
+#. Label flaky tests with ``xfail``
+
+This release includes the following **fixes**:
+
+#. Fix leak in ``SecurityManager::participant_volatile_message_secure_writer_``
+#. Fix Discovery Server over TCP
+#. Fix some leaks in XML DynamicTypes Parser
+#. Correct liveliness state in a multiple reader - one writer scenario
+#. Fix support for ``@key`` annotation in Dynamic types
+#. Properly delete builtin statistics writers upon ``delete_contained_entities()``
+#. Correctly initialize ``MatchingFailureMask`` constants to be used with the ``std::bitset`` API
+#. Set DataSharing in ``Writer|ReaderProxyData``
+#. Only apply content filter to ALIVE changes
+#. Handle errors when setting socket buffer sizes
+#. Automatically unmatch remote participants on participant deletion
+#. Fix on_sample_lost notification on best-effort readers for fragmented samples
+#. Handle errors when setting socket buffer sizes
+#. Fix DS servers not connecting due to ports logic
+#. Manual fix for documentation generation
+#. Create ``InitialConnection`` for TCP initial peers

docs/spelling_wordlist.txt

@@ -25,6 +25,7 @@ autoid
 automake
 backoff
 backport
+backported
 backports
 benchmarking
 bitfield