DOCSP-16201 BACKPORT (#572)

* DOCSP-16201 BACKPORT

* Update release version

Author: Dave

source/reference/command/serverStatus.txt

@@ -1444,6 +1444,35 @@ opcounters
    </reference/command>` **except** the write commands:
    :dbcommand:`insert`, :dbcommand:`update`, and :dbcommand:`delete`.
 
+.. serverstatus:: opcounters.deprecated
+
+   This section only appears in the :method:`db.serverStatus()` output
+   when one of the following, deprecated opcodes has been used:
+   
+   .. code-block:: javascript
+
+      "deprecated": {
+         "opQuery": NumberLong(<num>),
+         "opGetMore": NumberLong(<num>),
+         "opKillCursors": NumberLong(<num>),
+         "opDelete": NumberLong(<num>),
+         "opUpdate": NumberLong(<num>),
+         "opInsert": NumberLong(<num>),
+         "total": NumberLong(<num>),
+      }
+
+   These opcodes were deprecated in MongoDB 4.0.26 and support for
+   these opcodes is removed in MongoDB 5.1. Starting in MongoDB 5.1,
+   :binary:`~bin.mongod` refuses requests that use a deprecated
+   opcode and increments the corresponding counter.
+
+   ``OP_QUERY`` is an exception to the general rule.
+   :binary:`~bin.mongod` continues to support ``hello`` and
+   ``isMaster`` requests that use ``OP_QUERY``. :binary:`~bin.mongod`
+   refuses any other ``OP_QUERY`` requests.
+
+   The counters are reset when :binary:`~bin.mongod` starts.
+
 .. _server-status-opcountersrepl:
 .. _server-status-opcounters-repl: