Alerts PageCount default value 25 (Azure#27540)

Co-authored-by: Xiaogang <[email protected]>

Author: Avivskie

src/AlertsManagement/AlertsManagement.Test/SessionRecords/Microsoft.Azure.Commands.AlertsManagement.Test.ScenarioTests.AlertTests/TestAlertChangeState.json

@@ -1,7 +1,7 @@
 {
   "Entries": [
     {
-      "RequestUri": "/subscriptions/dd91de05-d791-4ceb-b6dc-988682dc7d72/providers/Microsoft.AlertsManagement/alerts?alertState=New&includeContext=false&includeEgressConfig=false&pageCount=0&timeRange=1h&api-version=2019-05-05-preview",
+      "RequestUri": "/subscriptions/dd91de05-d791-4ceb-b6dc-988682dc7d72/providers/Microsoft.AlertsManagement/alerts?alertState=New&includeContext=false&includeEgressConfig=false&pageCount=25&timeRange=1h&api-version=2019-05-05-preview",
       "EncodedRequestUri": "L3N1YnNjcmlwdGlvbnMvZGQ5MWRlMDUtZDc5MS00Y2ViLWI2ZGMtOTg4NjgyZGM3ZDcyL3Byb3ZpZGVycy9NaWNyb3NvZnQuQWxlcnRzTWFuYWdlbWVudC9hbGVydHM/YWxlcnRTdGF0ZT1OZXcmaW5jbHVkZUNvbnRleHQ9ZmFsc2UmaW5jbHVkZUVncmVzc0NvbmZpZz1mYWxzZSZwYWdlQ291bnQ9MCZ0aW1lUmFuZ2U9MWgmYXBpLXZlcnNpb249MjAxOS0wNS0wNS1wcmV2aWV3",
       "RequestMethod": "GET",
       "RequestBody": "",

src/AlertsManagement/AlertsManagement.Test/SessionRecords/Microsoft.Azure.Commands.AlertsManagement.Test.ScenarioTests.AlertTests/TestGetAlertsFilteredByParameters.json

@@ -171,12 +171,12 @@ public class GetAzureAlertCommand : AlertsManagementBaseCmdlet
         /// Page count
         /// </summary>
         [Parameter(Mandatory = false,
-                   ParameterSetName = AlertsListByFilterParameterSet,
-                   HelpMessage = "Number of alerts to be fetched in a page.")]
+            ParameterSetName = AlertsListByFilterParameterSet,
+            HelpMessage = "Number of alerts to be fetched in a page.")]
         [Parameter(Mandatory = false,
-                   ParameterSetName = AlertsListByTargetResourceIdFilterParameterSet,
-                   HelpMessage = "Number of alerts to be fetched in a page.")]
-        public int PageCount { get; set; }
+            ParameterSetName = AlertsListByTargetResourceIdFilterParameterSet,
+            HelpMessage = "Number of alerts to be fetched in a page.")]
+        public int PageCount { get; set; } = 25;
 
         /// <summary>
         /// Alert property to use while sorting

src/AlertsManagement/AlertsManagement/AlertCommands/GetAzureAlert.cs

@@ -18,6 +18,7 @@
         - Additional information about change #1
 -->
 ## Upcoming Release
+* Bugfix of default pageCount from 0 to 25.
 * Introduced various new features by upgrading code generator. Please see detail [here](https://github.com/Azure/azure-powershell/blob/main/documentation/Autorest-powershell-v4-new-features.md).
 
 ## Version 0.6.3