docs: add modules to usagestats

source/contents.rst

@@ -9,7 +9,7 @@
    configuration
    scripting
    certificates
-   usagestats
+   statusapi
    howto/index
    troubleshooting
    community

source/controlapi.rst

@@ -36,7 +36,7 @@ that comprises four primary options:
 
    * - **/status**
      - Queried for
-       :doc:`usage statistics <usagestats>`.
+       :doc:`usage statistics <statusapi>`.
 
 
 .. _configuration-socket:

source/usagestats.rst → source/statusapi.rst

@@ -7,19 +7,23 @@
 .. _configuration-stats:
 
 ****************
-Usage statistics
+Status API
 ****************
 
-Unit collects instance- and app-wide metrics,
-available via the **GET**-only **/status** section of the
-:ref:`control API <configuration-api>`:
+Unit collects information about the loaded language models, as well as
+instance- and app-wide metrics, and makes them available via the **GET**-only
+**/status** section of the :ref:`control API <configuration-api>`:
 
 .. list-table::
     :header-rows: 1
 
     * - Option
       - Description
 
+    * - **modules**
+      - Object;
+        lists currently loaded language modules.
+
     * - **connections**
       - Object;
         lists per-instance connection statistics.
@@ -37,6 +41,24 @@ Example:
 .. code-block:: json
 
    {
+       "modules": {
+           "python": [
+               {
+                   "version": "3.12.3",
+                   "lib": "/opt/unit/modules/python.unit.so"
+               },
+               {
+                   "version": "3.8",
+                   "lib": "/opt/unit/modules/python-3.8.unit.so"
+               }
+           ],
+
+           "php": {
+              "version": "8.3.4",
+              "lib": "/opt/unit/modules/php.unit.so"
+           }
+       },
+
        "connections": {
            "accepted": 1067,
            "active": 13,
@@ -63,6 +85,29 @@ Example:
        }
    }
 
+Each item in the **modules** object lists one of the currently loaded language
+modules, the installed version (or versions) of the module, and the path to the
+module file:
+
+.. list-table::
+    :header-rows: 1
+
+    * - Option
+      - Description
+
+    * - **name**
+      - String;
+        language module name.
+
+    * - **version**
+      - String;
+        language module version. If multiple versions are loaded,
+        the list contains multiple items.
+
+    * - **lib**
+      - String;
+        path to the language module file.
+
 The **connections** object offers the following Unit instance metrics:
 
 .. list-table::