DOCS-15403 v5.3 (#1231)

* DOCS-15403 4.2.21 release notes

* update

Author: ianf-mongodb

source/includes/changelogs/releases/4.2.21.rst

@@ -0,0 +1,24 @@
+.. _4.2.21-changelog:
+
+4.2.21 Changelog
+----------------
+
+Build and Packaging
+~~~~~~~~~~~~~~~~~~~
+
+- :issue:`SERVER-64332` Notarize MongoDB builds for macos
+- :issue:`SERVER-67139` Update rhel6 package test ami
+
+Internals
+~~~~~~~~~
+
+- :issue:`SERVER-58506` Command to expose settability for Server Parameters
+- :issue:`SERVER-61097` SizeStorer can cause deadlocks with cache eviction
+- :issue:`SERVER-64184` Track usage of allowDiskUse:true in agg command
+- :issue:`SERVER-65166` Use compareOptimes in abort_in_progress_transactions_on_step_up.js
+- :issue:`SERVER-65244` Add RHEL 7 s390x to 4.2
+- :issue:`SERVER-66176` [v4.4/v4.2] Minimize work under CollectionCatalog mutex
+- :issue:`SERVER-66559` Expand the internalQueryMaxAddToSetBytes param from 32 to 64 bits
+- :issue:`SERVER-66799` Fix getParameterWithDetails.js failure on ephemeralForTest
+- :issue:`SERVER-66955` Remove JSON.send usage in perf projects
+

source/release-notes/4.2-changelog.txt

@@ -10,6 +10,8 @@
    :depth: 1
    :class: singlecol
 
+.. include:: /includes/changelogs/releases/4.2.21.rst
+
 .. include:: /includes/changelogs/releases/4.2.20.rst
 
 .. include:: /includes/changelogs/releases/4.2.19.rst

source/release-notes/4.2.txt

@@ -13,6 +13,23 @@ Release Notes for MongoDB 4.2
 Patch Releases
 --------------
 
+.. _4.2.21-release-notes:
+
+4.2.21 - Upcoming
+~~~~~~~~~~~~~~~~~
+
+Issues fixed in 4.2.21:
+
+- :issue:`SERVER-62272`  Adding schema validation to a collection can prevent chunk migrations of failing documents
+- :issue:`SERVER-66176`  [v4.4/v4.2] Minimize work under CollectionCatalog mutex
+- :issue:`SERVER-61097`  SizeStorer can cause deadlocks with cache eviction
+- :issue:`SERVER-58506`  Command to expose settability for Server Parameters
+
+- `All JIRA issues closed in 4.2.21
+  <https://jira.mongodb.org/issues/?jql=project%20in%20(SERVER%2CTOOLS%2CWT)%20AND%20resolution%3D%27Fixed%27%20and%20fixversion%3D%274.2.21%27>`__
+
+- :ref:`4.2.21-changelog`
+
 .. _4.2.20-release-notes:
 
 4.2.20 - May 9, 2022