docs: add release notes for 0.26.2 (#8245)

Add release notes for 0.26.2.

docs/release-notes.rst

@@ -10,6 +10,80 @@
  Version 0.26
 **************
 
+Version 0.26.2
+==============
+
+**Release Date:** October 25, 2023
+
+Notice: The ``ruamel.yaml`` library's 0.18.0 release includes breaking changes that affect earlier
+versions of Determined. The failure behavior is that commands that emit YAML, such as ``det
+experiment config``, will emit nothing to ``stdout`` or ``stderr`` but instead silently exit 1 due
+to the new version of ``ruamel.yaml``. This release of Determined has included a
+``ruamel.yaml<0.18.0`` requirement, but older versions of Determined will also be affected, so users
+of older versions of Determined may have to manually downgrade ``ruamel.yaml`` if they observe this
+behavior.
+
+**New Features**
+
+-  Python SDK: Add various new features and enhancements. A few highlights are listed below.
+
+   -  Add support for downloading a zipped archive of experiment code
+      (:meth:`Experiment.download_code <determined.experimental.client.Experiment.download_code>`).
+
+   -  Add support for :class:`~determined.experimental.client.Project` and
+      :class:`~determined.experimental.client.Workspace` as SDK objects.
+
+   -  Surface more attributes to resource classes, including ``hparams`` and ``summary_metrics`` for
+      :class:`~determined.experimental.client.Trial`.
+
+   -  Add support for fetching and filtering multiple experiments with
+      :meth:`client.list_experiments <determined.experimental.client.list_experiments>`.
+
+   -  Add support for filtering trial logs by timestamp and a query string using
+      :meth:`Trial.iter_logs <determined.experimental.client.Trial.iter_logs>`.
+
+   -  All resource objects now have a ``.reload()`` method that refreshes the resource's attributes
+      from the server. Previously, attributes were most easily refreshed by creating an entirely new
+      object.
+
+-  Python SDK: All ``GET`` API calls now retry the request up to 5 times on failure.
+
+**Deprecated Features**
+
+-  Python SDK: Several methods have been renamed for better API standardization.
+
+   -  Methods returning a ``List`` and ``Iterator`` now have names starting with ``list_*`` and
+      ``iter_*``, respectively.
+
+   -  :class:`~determined.experimental.client.TrialReference` and
+      :class:`~determined.experimental.client.ExperimentReference` are now
+      :class:`~determined.experimental.client.Trial` and
+      :class:`~determined.experimental.client.Experiment`.
+
+-  Python SDK: Consolidate various ways of fetching checkpoints.
+
+   -  :meth:`Experiment.top_checkpoint <determined.experimental.client.Experiment.top_checkpoint>`
+      and :meth:`Experiment.top_n_checkpoints
+      <determined.experimental.client.Experiment.top_n_checkpoints>` are deprecated in favor of
+      :meth:`Experiment.list_checkpoints
+      <determined.experimental.client.Experiment.list_checkpoints>`.
+
+   -  :meth:`Trial.get_checkpoints <determined.experimental.client.Trial.get_checkpoints>`,
+      :meth:`Trial.top_checkpoint <determined.experimental.client.Trial.top_checkpoint>`, and
+      :meth:`Trial.select_checkpoint <determined.experimental.client.Trial.select_checkpoint>` are
+      deprecated in favor of :meth:`Trial.list_checkpoints
+      <determined.experimental.client.Trial.list_checkpoints>`.
+
+-  Python SDK: Deprecate resource ordering enum classes (``CheckpointOrderBy``,
+   ``ExperimentOrderBy``, ``TrialOrderBy``, ``ModelOrderBy``) in favor of a shared
+   :class:`~determined.experimental.client.OrderBy`.
+
+**Bug Fixes**
+
+-  Core API: On context closure, properly save all TensorBoard files not related to metrics
+   reporting, particularly the native profiler traces.
+-  Core API v2: Fix an issue where TensorBoard files were not saved for managed experiments.
+
 Version 0.26.1
 ==============