Add known issue re: client sessions to release notes
@@ -27,6 +27,14 @@ version 1.0 release. The focus of the 1.0 release will be implementing
build automation to enforce API stability, and a very small number of
high value features. For more information see the `project roadmap`_.
+Known Issues
+------------
+
+The ClientSession APIs defined in `bokeh.client.session`, such as
+`push_session`, don't currently support the new `on_event` interface for
+UI event callbacks in Bokeh Server application. This deficiency is expected
+to be addressed in the next Bokeh release.
+
Migration Guide
---------------
