(DOCS) Update reference/changelog for preview.8

This change updates the reference documentation and changelog for
the rest of the PRs in the `preview.8` release. It includes some
fixes for the docs discovered when publishing to the Learn platform.

Author: michaeltlombardi

CHANGELOG.md

@@ -2,7 +2,8 @@
 title: "Desired State Configuration changelog"
 description: >-
   A log of the changes for releases of DSCv3.
-ms.date: 03/06/2024
+ms.topic: whats-new
+ms.date: 06/24/2024
 ---
 
 # Changelog
@@ -45,7 +46,7 @@ This section includes a summary of user-facing changes since the last release. F
 changes since the last release, see the [diff on GitHub][unreleased].
 
 <!-- Unreleased comparison link - always update version to match last release tag-->
-[unreleased]: https://github.com/PowerShell/DSC/compare/v3.0.0-preview.7...main
+[unreleased]: https://github.com/PowerShell/DSC/compare/v3.0.0-preview.8...main
 
 <!--
     Unreleased change entry instructions:
@@ -70,25 +71,55 @@ changes since the last release, see the [diff on GitHub][unreleased].
     for the `v3.0.0.0-alpha.5` release. Leave the release links under the release section.
 -->
 
+<!-- Unreleased change links -->
+
+## [v3.0.0-preview.8][release-v3.0.0-preview.8] - 2024-06-19
+
+This section includes a summary of changes for the `preview.8` release. For the full list of changes
+in this release, see the [diff on GitHub][compare-v3.0.0-preview.8].
+
+<!-- Release links -->
+[release-v3.0.0-preview.8]: https://github.com/PowerShell/DSC/releases/tag/v3.0.0-preview.8 "Link to the DSC v3.0.0-preview.8 release on GitHub"
+[compare-v3.0.0-preview.8]: https://github.com/PowerShell/DSC/compare/v3.0.0-preview.7...v3.0.0-preview.8
+
+### Changed
+
+- Changed the `Microsoft.DSC/PowerShell` adapter to only handle PowerShell DSC Resources
+  implemented as classes and remove the dependency on the **PSDesiredStateConfiguration** module.
+  The `Microsoft.Windows/WindowsPowerShell` adapter continues to work with classic PSDSC resources.
+  Neither adapter supports composite PSDSC resources. This change simplified the code and coincided
+  with ensuring that the `Microsoft.DSC/PowerShell` adapter works correctly on Linux and macOS as
+  well as Windows. This change also brought performance improvements to the adapter, speeding up
+  resource invocation and discovery.
+
+  <details><summary>Related work items</summary>
+
+  - Issues: _None_.
+  - PRs:
+    - [#435][#435]
+    - [#439][#439]
+
+  </details>
+
 ### Added
 
-- Added the [`--what-if` (`-w`)][ur-aa] option to the [dsc config set][cmd-cset] command. When you
+- Added the [`--what-if` (`-w`)][p8-01] option to the [dsc config set][cmd-cset] command. When you
   call `dsc config set` with the `--what-if` option, DSC doesn't actually invoke the resources to
   enforce the desired state. Instead, it returns the expected output for the command, showing the
   before and after state for each resource instance.
 
   The output for the `dsc config set` operation with the `--what-if` operation is the same as an
-  [actual configuration set operation][ur-ab], except that the metadata field
-  [executionType][ur-ac] is set to `WhatIf` instead of `Actual`.
+  [actual configuration set operation][p8-02], except that the metadata field
+  [executionType][p8-03] is set to `WhatIf` instead of `Actual`.
 
   By default, the generated output is synthetic, based on the results of the resources' `test`
-  operation. Resources can define the [whatIf][ur-ad] property in their resource manifest to
+  operation. Resources can define the [whatIf][p8-04] property in their resource manifest to
   participate in what-if operations, reporting more specifically how they will change the system.
   For example, participating resources could indicate whether an actual set operation will require
   a reboot or whether the current user has the correct permissions to manage that resource
   instance.
 
-  Participating resources have the [WhatIf capability][ur-ae].
+  Participating resources have the [WhatIf capability][p8-05].
 
   <details><summary>Related work items</summary>
 
@@ -99,21 +130,23 @@ changes since the last release, see the [diff on GitHub][unreleased].
 
   </details>
 
-- Added support for [importer resources][ur-af]. These resources resolve external sources to a
+- Added support for [importer resources][p8-06]. These resources resolve external sources to a
   nested DSC Configuration document. The resolved instances are processed as nested resource
   instances.
 
   This required some updates to the schemas, all backwards-compatible:
 
-  - Added a new [resourceKind][ur-ag] named `Import`.
-  - Added the [resolve][ur-ah] command to resource manifests.
-  - Added the new [`Resolve`][ur-ai] capability, returned in the output for the
+  - Added a new [resourceKind][p8-07] named `Import`.
+  - Added the [resolve][p8-08] command to resource manifests.
+  - Added the new [`Resolve`][p8-09] capability, returned in the output for the
     [dsc resource list][cmd-rlist] command when DSC discovers an importer resource.
 
   <details><summary>Related work items</summary>
 
   - Issues: [#429][#429]
-  - PRs: [#412][#412]
+  - PRs:
+    - [#412][#412]
+    - [#464][#464]
 
   </details>
 
@@ -207,9 +240,20 @@ changes since the last release, see the [diff on GitHub][unreleased].
 
   </details>
 
+- Added the `Microsoft.DSC.Experimental/SystemctlService` class-based PSDSC resource. It has the
+  `Get` and `Export` [capabilities][p8-10]. You can use it on Linux systems that manage services
+  with SystemD and `systemctl`. In this release, it doesn't support setting services.
+
+  <details><summary>Related work items</summary>
+
+  - Issues: _None_.
+  - PRs: [#454][#454]
+
+  </details>
+
 ### Fixed
 
-- Fixed the JSON Schema for [exit codes][ur-fa] in the resource manifest to support negative
+- Fixed the JSON Schema for [exit codes][p8-11] in the resource manifest to support negative
   integers. Prior to this release, the DSC engine supported negative exit codes but the JSON Schema
   forbid them.
 
@@ -243,17 +287,18 @@ changes since the last release, see the [diff on GitHub][unreleased].
 
   </details>
 
-<!-- Unreleased change links -->
-[ur-aa]: ./docs/reference/cli/config/set.md#-w---what-if
-[ur-ab]: ./docs/reference/schemas/outputs/config/set.md
-[ur-ac]: ./docs/reference/schemas/metadata/Microsoft.DSC/properties.md#executiontype
-[ur-ad]: ./docs/reference/schemas/resource/manifest/whatif.md
-[ur-ae]: ./docs/reference/schemas/outputs/resource/list.md#capability-whatif
-[ur-af]: ./docs/reference/schemas/definitions/resourceKind.md#importer-resources
-[ur-ag]: ./docs/reference/schemas/definitions/resourceKind.md
-[ur-ah]: ./docs/reference/schemas/resource/manifest/resolve.md
-[ur-ai]: ./docs/reference/schemas/outputs/resource/list.md#capability-resolve
-[ur-fa]: ./docs/reference/schemas/resource/manifest/root.md#exitcodes
+<!-- Preview.8 links -->
+[p8-01]: ./docs/reference/cli/config/set.md#-w---what-if
+[p8-02]: ./docs/reference/schemas/outputs/config/set.md
+[p8-03]: ./docs/reference/schemas/metadata/Microsoft.DSC/properties.md#executiontype
+[p8-04]: ./docs/reference/schemas/resource/manifest/whatif.md
+[p8-05]: ./docs/reference/schemas/outputs/resource/list.md#capability-whatif
+[p8-06]: ./docs/reference/schemas/definitions/resourceKind.md#importer-resources
+[p8-07]: ./docs/reference/schemas/definitions/resourceKind.md
+[p8-08]: ./docs/reference/schemas/resource/manifest/resolve.md
+[p8-09]: ./docs/reference/schemas/outputs/resource/list.md#capability-resolve
+[p8-10]: ./docs/reference/schemas/outputs/resource/list.md#capabilities
+[p8-11]: ./docs/reference/schemas/resource/manifest/root.md#exitcodes
 
 ## [v3.0.0-preview.7][release-v3.0.0-preview.7] - 2024-04-22
 
@@ -309,10 +354,12 @@ in this release, see the [diff on GitHub][compare-v3.0.0-preview.7].
 
   </details>
 
-- <a id="rename-provider-to-adapter" /> In this release, the term `DSC Resource Provider` is
-  replaced with the more semantically accurate `DSC Resource Adapter`. These resources enable users
-  to leverage resources that don't define a DSC Resource Manifest with DSC, like PSDSC resources -
-  they're _adapters_ between DSCv3 and resources defined in a different way.
+- <a id="rename-provider-to-adapter"></a>
+
+  In this release, the term `DSC Resource Provider` is replaced with the more semantically accurate
+  `DSC Resource Adapter`. These resources enable users to leverage resources that don't define a
+  DSC Resource Manifest with DSC, like PSDSC resources - they're _adapters_ between DSCv3 and
+  resources defined in a different way.
 
   Beyond using different terminology in the documentation, this change also renamed the resource
   manifest property `provider` to [adapter][p7-01], and the `requires` property in the output for
@@ -1522,9 +1569,13 @@ For the full list of changes in this release, see the [diff on GitHub][compare-v
 [#431]: https://github.com/PowerShell/DSC/issues/431
 [#432]: https://github.com/PowerShell/DSC/issues/432
 [#434]: https://github.com/PowerShell/DSC/issues/434
+[#435]: https://github.com/PowerShell/DSC/issues/435
 [#438]: https://github.com/PowerShell/DSC/issues/438
+[#439]: https://github.com/PowerShell/DSC/issues/439
 [#441]: https://github.com/PowerShell/DSC/issues/441
 [#444]: https://github.com/PowerShell/DSC/issues/444
+[#454]: https://github.com/PowerShell/DSC/issues/454
+[#464]: https://github.com/PowerShell/DSC/issues/464
 [#45]:  https://github.com/PowerShell/DSC/issues/45
 [#49]:  https://github.com/PowerShell/DSC/issues/49
 [#57]:  https://github.com/PowerShell/DSC/issues/57

docs/reference/cli/config/get.md

@@ -1,6 +1,6 @@
 ---
 description: Command line reference for the 'dsc config get' command
-ms.date:     01/17/2024
+ms.date:     06/24/2024
 ms.topic:    reference
 title:       dsc config get
 ---
@@ -52,7 +52,7 @@ document saved as `example.dsc.config.yaml`.
 $schema: https://raw.githubusercontent.com/PowerShell/DSC/main/schemas/2024/04/config/document.json
 resources:
 - name: Windows only
-  type: DSC/AssertionGroup
+  type: Microsoft.DSC/Assertion
   properties:
     $schema: https://raw.githubusercontent.com/PowerShell/DSC/main/schemas/2024/04/config/document.json
     resources:
@@ -64,9 +64,9 @@ resources:
   type: Microsoft.Windows/Registry
   properties:
     keyPath: HKCU\example
-    _ensure: Present
+    _exist: true
   dependsOn:
-    - '[DSC/Assertion]Windows only'
+    - "[resourceId('Microsoft.DSC/Assertion', 'Windows only')"
 ```
 
 ```sh

docs/reference/cli/config/set.md

@@ -1,6 +1,6 @@
 ---
 description: Command line reference for the 'dsc config set' command
-ms.date:     01/17/2024
+ms.date:     06/24/2024
 ms.topic:    reference
 title:       dsc config set
 ---
@@ -53,7 +53,7 @@ The command inspects the resource instances defined in the configuration documen
 $schema: https://raw.githubusercontent.com/PowerShell/DSC/main/schemas/2024/04/config/document.json
 resources:
 - name: Windows only
-  type: DSC/AssertionGroup
+  type: Microsoft.DSC/Assertion
   properties:
     $schema: https://raw.githubusercontent.com/PowerShell/DSC/main/schemas/2024/04/config/document.json
     resources:
@@ -65,9 +65,9 @@ resources:
   type: Microsoft.Windows/Registry
   properties:
     keyPath: HKCU\example
-    _ensure: Present
+    _exist: true
   dependsOn:
-    - '[DSC/Assertion]Windows only'
+    - "[resourceId('Microsoft.DSC/Assertion', 'Windows only')"
 ```
 
 ```sh

docs/reference/cli/config/test.md

@@ -1,6 +1,6 @@
 ---
 description: Command line reference for the 'dsc config test' command
-ms.date:     01/17/2024
+ms.date:     06/24/2024
 ms.topic:    reference
 title:       dsc config test
 ---
@@ -52,7 +52,7 @@ resource instances defined in the configuration document saved as `example.dsc.c
 $schema: https://raw.githubusercontent.com/PowerShell/DSC/main/schemas/2024/04/config/document.json
 resources:
 - name: Windows only
-  type: DSC/AssertionGroup
+  type: Microsoft.DSC/Assertion
   properties:
     $schema: https://raw.githubusercontent.com/PowerShell/DSC/main/schemas/2024/04/config/document.json
     resources:
@@ -64,9 +64,9 @@ resources:
   type: Microsoft.Windows/Registry
   properties:
     keyPath: HKCU\example
-    _ensure: Present
+    _exist: true
   dependsOn:
-    - '[DSC/Assertion]Windows only'
+    - "[resourceId('Microsoft.DSC/Assertion', 'Windows only')"
 ```
 
 ```sh