Update ReleaseNotes
Prepare to launch 9.2.1.9 ship!
Fix the queryset
Add migration to chase new values in autotune

Ticket:	#6620
(cherry picked from commit 8774414a88e930543e74a677d746d8a46b75c9e5)
Revert "Add migration to chase new values in autotune"

This reverts commit 279d0599f095860e12a3f4c2bc4186a5ea8a28ab.
Add migration to chase new values in autotune

Regenerated for 9.2.1-BRANCH.

Ticket:	#6620