DOCSP-43393 Older Version Support (#410) (#420)

* DOCSP-43393 Older Version Support

* add to feature table + footnote

* wording

* typo

* external feedback

* *

* *

Author: ajhuh-mdb

source/includes/table-beta-compatibility.rst

@@ -2,6 +2,7 @@
    :header-rows: 1
    :stub-columns: 1
    :class: compatibility
+   :widths: 16 12 12 12 12 12 12 12
 
    * - 
      - Many-to-One
@@ -10,6 +11,7 @@
      - Namespace Remapping 
      - Oplog Rollover Resilience
      - Destination Data Handling 
+     - Pre-6.0 Version Support
 
    * - Many-to-One
      -
@@ -18,6 +20,7 @@
      - |checkmark|
      - |checkmark|
      - |checkmark|
+     - |checkmark|
 
    * - A->B->C Migration
      - 
@@ -26,6 +29,7 @@
      - |checkmark|
      - |checkmark|
      - |checkmark|
+     - |checkmark| [#pre-6.0-abc]_
 
    * - Document Filtering 
      - 
@@ -34,6 +38,7 @@
      - |checkmark|
      - |checkmark|
      - |checkmark|
+     -
 
    * - Namespace Remapping 
      - |checkmark|
@@ -42,6 +47,7 @@
      - 
      - |checkmark|
      - |checkmark|
+     -
 
    * - Oplog Rollover Resilience
      - |checkmark|
@@ -50,11 +56,29 @@
      - |checkmark|
      - 
      - |checkmark|
+     - |checkmark|
 
    * - Destination Data Handling 
      - |checkmark|
      - |checkmark|
      - |checkmark|
      - |checkmark|
      - |checkmark|
-     - 
+     - 
+     - |checkmark|
+
+   * - Pre-6.0 Version Support
+     - |checkmark|
+     - |checkmark| [#pre-6.0-abc]_
+     - 
+     -
+     - |checkmark|
+     - |checkmark|
+     -
+
+.. [#pre-6.0-abc]
+
+   A->B->C migrations are compatible with pre-6.0 version support only if 
+   cluster A uses a server version older than 6.0. If cluster B uses a pre-6.0 
+   cluster, the second migration (B->C) can start only after the first migration 
+   (A->B) is committed.

source/reference/beta-program.txt

@@ -91,6 +91,12 @@ Beta Features
    * - :ref:`c2c-beta-orr`
      - .. include:: /includes/orr-intro.rst
 
+   * - Pre-6.0 Server Version Support 
+     - In {+c2c-beta-program-short+}, you can perform migrations between 
+       clusters running MongoDB server versions older than 6.0. To see 
+       guidelines and restrictions for migrating between older server 
+       versions, you must have access to the {+c2c-beta-program-short+} binary.
+
 Feature Compatibility Matrix
 ----------------------------