hide the --enable-managed-system-pool option for now (#9278)

* hide the --enable-managed-system-pool optoin for now

* add history

* keep _help.py

* fix style

* update setup.py

---------

Co-authored-by: Hao Yuan <hayua@microsoft.com>

Author: hao1939

src/aks-preview/HISTORY.rst

@@ -14,6 +14,10 @@ Pending
 * Vendor new SDK and bump API version to 2025-08-02-preview.
 * Pre-deprecate `--enable-custom-ca-trust` and `--disable-custom-ca-trust` in `az aks create`, `az aks update` commands.
 
+18.0.0b44
++++++++
+* Hide `--enable-managed-system-pool` parameter for `az aks create` for now, as the feature is not ready yet.
+
 18.0.0b43
 +++++++
 * Fix `--localdns-config` parameter to handle null values and case-insensitive JSON keys in DNS override sections, preventing crashes with malformed localdns configuration files.
@@ -45,7 +49,7 @@ Pending
 * Add option `AzureLinuxOSGuard` and `AzureLinux3OSGuard` to `--os-sku` for `az aks nodepool add` and `az aks nodepool update`.
 * Add machine command `az aks machine add` to add a machine to an existing machine pool.
 * Add blue-green upgrade strategy support for AKS node pools:
-  - `az aks nodepool add/update/upgrade`: Add `--upgrade-strategy` parameter to switch between rolling and blue-green nodepool upgrades. 
+  - `az aks nodepool add/update/upgrade`: Add `--upgrade-strategy` parameter to switch between rolling and blue-green nodepool upgrades.
   - `az aks nodepool add/update/upgrade`: Add `--drain-batch-size`, `--drain-timeout-bg`, `--batch-soak-duration`, `--final-soak-duration` parameters to configure blue-green upgrade settings.
 
 18.0.0b38

src/aks-preview/azext_aks_preview/_params.py

@@ -1127,7 +1127,10 @@ def load_arguments(self, _):
         # virtual machines
         c.argument("vm_sizes", is_preview=True)
         c.argument("enable_imds_restriction", action="store_true", is_preview=True)
-        c.argument("enable_managed_system_pool", action="store_true", is_preview=True)
+        c.argument("enable_managed_system_pool",
+                   action="store_true",
+                   is_preview=True,
+                   deprecate_info=c.deprecate(target="--enable-managed-system-pool", hide=True))
         c.argument("enable_upstream_kubescheduler_user_configuration", action="store_true", is_preview=True)
 
     with self.argument_context("aks update") as c:

src/aks-preview/setup.py

@@ -9,7 +9,7 @@
 
 from setuptools import find_packages, setup
 
-VERSION = "18.0.0b43"
+VERSION = "18.0.0b44"
 
 CLASSIFIERS = [
     "Development Status :: 4 - Beta",