docs: add release notes for 0.30.0 (#9103)

release notes for 0.30.0

(cherry picked from commit 97aaa02)

docs/release-notes.rst

@@ -6,6 +6,53 @@
  Release Notes
 ###############
 
+**************
+ Version 0.30
+**************
+
+Version 0.30.0
+==============
+
+**Release Date:** April 04, 2024
+
+**Breaking Changes**
+
+-  API: :class:`~determined.pytorch.Trainer` no longer supports the ``Trainer.configure_profiler``
+   option. Profiling is now enabled through the ``Trainer.fit(profiling_enabled=True)`` call.
+
+-  Database migration: System metrics collected by the Determined profiler are now stored in the
+   generic ``metrics`` table. This requires a few schema changes to the ``metrics`` table that will
+   be run during migrations.
+
+   .. important::
+
+      This migration may take more time for deployments with a large amount of stored metrics.
+
+**New Features**
+
+-  Core API: The Determined profiler is now accessible from the Core API. It collects system
+   metrics, which can be viewed in the WebUI under the experiment's "Profiler" tab. See the
+   :ref:`Core API guide <core-profiler>` for details.
+
+**Removed Features**
+
+-  Profiler: Support for timing metrics and related configurations has been removed. The Determined
+   profiler now only collects system metrics and defers to our native profiler integrations for
+   training-specific profiling. Users are encouraged to configure profilers native to their
+   :ref:`training API <apis-howto-overview>` for this functionality.
+
+   -  Historical data for timing metrics is retained in the ``trial_profiler_metrics`` database
+      table, but they are no longer being collected or rendered in the WebUI.
+
+   -  Historical data for system metrics generated by trials before this release are not
+      automatically migrated due to time cost. For users wanting to view historical system metrics
+      in the WebUI, we provide an `optional migration script
+      <https://github.com/determined-ai/determined/blob/main/master/static/optional_migrations/20240325144732_trial-profiler-metrics-migration.tx.up.sql>`__
+      that can be run manually.
+
+   -  Configuration: The ``timings_enabled``, ``begin_on_batch``, and ``end_after_batch`` options in
+      the ``profiling`` section of experiment configurations are no longer supported.
+
 **************
  Version 0.29
 **************