Added env var developer mode setting

source/configure/environment-configuration-settings.rst

@@ -4161,28 +4161,18 @@ This setting isn't available in the System Console and can only be set in ``conf
 | This feature's ``config.json`` setting is ``"EnableAPIChannelDeletion": false`` with options ``true`` and ``false``. |
 +----------------------------------------------------------------------------------------------------------------------+
 
-.. config:setting:: exp-enableapipostdeletion
-  :displayname: Enable API post deletion (ServiceSettings)
-  :systemconsole: N/A
-  :configjson: EnableAPIPostDeletion
-  :environment: N/A
-
-  - **true**: The ``api/v4/posts/{postid}?permanent=true`` API endpoint can be called by system admins (or users with appropriate permissions), or by running the mmctl post delete command, to permanently delete a message and its attachments.
-  - **false**: **(Default)** The API endpoint cannot be called, but ``api/v4/posts/{postid}`` can still be used to soft delete a message without removing it from the database.
-
-Enable API post deletion
-~~~~~~~~~~~~~~~~~~~~~~~~
-
-This setting isn't available in the System Console and can only be set in ``config.json``.
-
-**True**: The ``api/v4/posts/{postid}?permanent=true`` API endpoint can be called by system admins (or users with appropriate permissions), or by running the :ref:`mmctl post delete <manage/mmctl-command-line-tool:mmctl post delete>` command, to permanently delete a message and its attachments.
+Enable desktop app developer mode
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-**False**: The API endpoint cannot be called. Note that ``api/v4/posts/{postid}`` can still be used to soft delete a channel without removing it from the database.
+From Desktop App v5.10, this setting enables developer debugging options available by going to the **View > Developer Tools** menu in the Mattermost desktop app. 
 
-+----------------------------------------------------------------------------------------------------------------------+
-| This feature's ``config.json`` setting is ``"EnableAPIPostDeletion": false`` with options ``true`` and ``false``.    |
-+----------------------------------------------------------------------------------------------------------------------+
+This setting isn't available in the System Console and can only be enabled in ``config.json`` by setting the environment variable ``MM_DESKTOP_DEVELOPER_MODE`` to ``true``. This setting is disabled by default.
 
-.. note::
+**True**: Unlocks the following options in the Desktop App for the purposes of troubleshooting and debugging. You should only enable this setting if instructed to by a Mattermost developer:
 
-  This configuration setting doesn't need to be enabled when running :doc:`mmctl </manage/mmctl-command-line-tool>` in :ref:`local mode <manage/mmctl-command-line-tool:local mode>`.
+  * **Browser Mode Only**: Completely disables the preload script and stops web app components from knowing they're in the desktop app. This option should be the best indicator of whether a web app component is causing performance and/or memory retention issues. This option disables notifications, cross-tab navigation, unread/mentions badges, the calls widget, and breaks resizing on macOS.
+  * **Disable Notification Storage**: Turns off maps that hold references to unread notifications until they've been selected & read. This option is good for debugging in cases where Mattermost is holding onto too many references to unused notifications.
+  * **Disable User Activity Monitor**: Turns off the interval that checks whether the user is away or not. This option is good for debugging whether a user's availability status is causing unexpected desktop app behavior.
+  * **Disable Context Menu**: Turns off the context menu attached to the BrowserViews. This option is good as a library santity check.
+  * **Force Legacy Messaging API**: Forces the app to revert back to the old messaging API instead of the newer contextBridge API. This option is a good santity check to confirm whether the new API is responsible for holding onto memory.
+  * **Force New Messaging API**: Forces the app to use the contextBridge API and completely disables the legacy one. This option forces off listeners for the legacy API.