Deprecate MAAS integration

This integration was previously set as experimental due
to lack of testing, maintenance and documentation[1]. It is
now being deprecated since it has eventlet code that
cannot be updated without a proper test environment and
some background knowledge on how it should work.
The removal of the code should happen before or together
with the removal of all other eventlet imports.

Change-Id: If5ac5e075275931e6e4024653ecd8043aca5d032
Signed-off-by: Douglas Viroel <viroel@gmail.com>

doc/source/integrations/index.rst

@@ -35,7 +35,7 @@ Integration Status Matrix
          - Minimal
          - Integration
        * - :ref:`MAAS <maas_integration>`
-         - Experimental
+         - Deprecated
          - Missing
          - Unit
        * - :ref:`Neutron <neutron_integration>`
@@ -95,8 +95,7 @@ MAAS (Metal As A Service)
 ^^^^^^^^^^^^^^^^^^^^^^^^^
 This integration allows managing bare metal servers of a MAAS service,
 which includes Actions that manage the power state of nodes. This
-integration is classified as Experimental and may be removed in future
-releases.
+integration is deprecated and will be removed in a future release.
 
 .. _neutron_integration:
 

releasenotes/notes/deprecate-maas-9dfbb7975d379231.yaml

@@ -0,0 +1,8 @@
+---
+deprecations:
+  - |
+    The MAAS (Metal as a Service) integration is now deprecated. This feature
+    was previously marked as experimental due to lack of testing, maintenance,
+    and documentation. The MAAS integration code is planned to be removed in
+    a future release, before or together with the removal of eventlet from
+    Watcher.

watcher/common/clients.py

@@ -235,13 +235,12 @@ class OpenStackClients:
         if self._maas:
             return self._maas
 
-        # NOTE(dviroel): This integration is classified as Experimental due to
-        # the lack of documentation and CI testing. It can be marked as
-        # supported or deprecated in future releases, based on improvements.
+        # NOTE(dviroel): This integration is deprecated due to the lack of
+        # maintenance and support. It has eventlet code that is required to be
+        # removed/replaced in future releases.
         debtcollector.deprecate(
-            ("MAAS is an experimental integration and may be "
-             "deprecated in future releases."),
-            version="2025.2", category=PendingDeprecationWarning)
+            ("MAAS integration is deprecated and it will be removed in a "
+             "future release."), version="2026.1", category=DeprecationWarning)
 
         if not maas_client:
             raise exception.UnsupportedError(