(DOCSP-18339): v20210824 release notes (#194)

Author: jwilliams-mongo

source/includes/changelog/data-lake-2021.rst

@@ -1,3 +1,17 @@
+.. _data-lake-v20210824:
+
+25 August 2021 Release
+~~~~~~~~~~~~~~~~~~~~~~
+
+- Provides various stability improvements.
+- Improves ``collStats`` and ``dbStats`` :ref:`command 
+  <mql-support-diagnostic-cmd>` performance and stability.
+- Adds support for the :pipeline:`$merge` aggregation pipeline stage.
+- Allows ``localField`` and ``foreignField`` with a more expressive
+  :doc:`$lookup </reference/pipeline/lookup-stage/>` aggregation
+  pipeline stage syntax.
+- Implements the ``$count`` accumulator.
+
 .. _data-lake-v20210803:
 
 03 August 2021 Release

source/reference/format/data-lake-configuration.txt

@@ -660,21 +660,19 @@ The {+data-lake-short+} configuration has the following format:
    the collections. Each database can have multiple ``collections`` and 
    ``views`` objects.
 
-.. tabs:: 
-   :hidden:
+.. datalakeconf:: databases.[n].name
 
-   .. tab:: S3  
-      :tabid: s3
+   .. tabs:: 
+      :hidden:
 
-      .. datalakeconf:: databases.[n].name
+      .. tab:: S3  
+         :tabid: s3
 
          Name of the database to which {+data-lake-short+} maps the
          data contained in the {+data-lake-store+}.
 
-   .. tab:: Atlas Cluster 
-      :tabid: atlas
-
-      .. datalakeconf:: databases.[n].name
+      .. tab:: Atlas Cluster 
+         :tabid: atlas
 
          Name of the database to which {+data-lake-short+} maps the
          data contained in the {+data-lake-store+}. You can generate 
@@ -689,10 +687,8 @@ The {+data-lake-short+} configuration has the following format:
            dynamically generate databases from multiple |service| 
            clusters or other data stores.
 
-   .. tab:: HTTP 
-      :tabid: http
-
-      .. datalakeconf:: databases.[n].name
+      .. tab:: HTTP 
+         :tabid: http
 
          Name of the database to which {+data-lake-short+} maps the
          data contained in the {+data-lake-store+}.