[IMP] odoo.sh: ip changes

closes odoo/documentation#10799

X-original-commit: ca18df8f27
Signed-off-by: Stanislas Sobieski (sts) <sts@odoo.com>

content/administration/odoo_sh/advanced/frequent_technical_questions.rst

@@ -29,3 +29,32 @@ We advise that:
 - Your scheduled actions should be
   `idempotent <https://stackoverflow.com/a/1077421/3332416>`_: they must not
   cause side-effects if they are started more often than expected.
+
+.. _ip-address-change:
+
+How can I automate tasks when an IP address change occurs?
+----------------------------------------------------------
+
+**Odoo.sh notifies project administrators of IP address changes.**
+Additionally, when the IP address of a production instance changes, an HTTP `GET` request is made
+to the path `/_odoo.sh/ip-change` with the new IP address included as a query string parameter
+(`new`), along with the previous IP address as an additional parameter (`old`).
+
+This mechanism allows custom actions to be applied in response to the IP address change
+(e.g., sending an email, contacting a firewall API, configuring database objects, etc.)
+
+For security reasons, the `/_odoo.sh/ip-change` route is accessible only internally by the platform
+itself and returns a `403` response if accessed through any other means.
+
+Here is a pseudo-implementation example:
+
+.. code-block:: python
+
+    class IPChangeController(http.Controller):
+
+        @http.route('/_odoo.sh/ip-change', auth='public')
+        def ip_change(self, old=None, new=None):
+            _logger.info("IP address changed from %s to %s", old, new)
+            # Then perform whatever action required for your use case, e.g., update an
+            # ir.config_parameter, send an email, contact an external firewall service's API, ...
+            return 'ok'