[#2707] Changes after review:

- config-get API docs updated
 - ctrl-channel section not mentions hashes

doc/sphinx/arm/ctrl-channel.rst

@@ -352,7 +352,9 @@ returned is roughly equal to the configuration that was loaded using the
 :isccmd:`config-set` command. However, there may be certain differences, as
 comments are not retained. If the original configuration used file
 inclusion, the returned configuration includes all parameters from
-all included files.
+all included files. Starting with 2.4.0, the successful response also
+contains a SHA-256 digest that can be used to easily determine if a
+configuration has changed or not.
 
 .. warning::
 
@@ -398,6 +400,10 @@ And the server's response:
         }
     }
 
+Starting with 2.4.0, also ``config-set`` and ``config-get`` return the SHA-256 hash
+of the new or current configuration. This may be used to later determine if a configuration
+has changed or not.
+
 .. isccmd:: config-reload
 .. _command-config-reload:
 
@@ -637,6 +643,9 @@ string, ``text``, describing the outcome:
 
        {"result": 1, "text": "unsupported parameter: BOGUS (<string>:16:26)" }
 
+Starting with 2.4.0, the successful response also contains a SHA-256 digest of the newly set configuration.
+The digest can be used to easily determine if a configuration has changed or not.
+
 .. isccmd:: shutdown
 .. _command-shutdown:
 

src/share/api/config-get.json

@@ -21,6 +21,11 @@
         "    }",
         "}"
     ],
+    "resp-comment": [
+        "Starting with Kea 2.4.0, the successful response contains an SHA256 digest of the configuration that was ",
+        "just retrieved. It might be used to determine if a configuration has been modified or not, possibly with the ",
+        "use of config-hash-get."
+    ],
     "support": [
         "kea-dhcp4",
         "kea-dhcp6",