Blazor app pool guidance (#24235)

Author: guardrex

aspnetcore/blazor/host-and-deploy/index.md

@@ -52,6 +52,12 @@ Publish locations:
 
 The assets in the folder are deployed to the web server. Deployment might be a manual or automated process depending on the development tools in use.
 
+## IIS Application Pools
+
+Sharing an app pool among ASP.NET Core apps isn't supported, including for Blazor apps. Use one app pool per app when hosting with IIS, and avoid the use of IIS's [virtual directories](/iis/get-started/planning-your-iis-architecture/understanding-sites-applications-and-virtual-directories-on-iis#virtual-directories) for hosting multiple apps.
+
+One or more Blazor WebAssembly apps hosted by an ASP.NET Core app, known as a [hosted Blazor WebAssembly solution](xref:blazor/hosting-models#blazor-webassembly), are supported for ***one*** app pool. However, we don't recommend or support assigning a single app pool to multiple hosted Blazor WebAssembly solutions or in sub-app hosting scenarios. For more information, see <xref:host-and-deploy/iis/advanced#sub-applications>.
+
 ## App base path
 
 The *app base path* is the app's root URL path. Consider the following ASP.NET Core app and Blazor sub-app:
@@ -211,6 +217,12 @@ Publish locations:
 
 The assets in the folder are deployed to the web server. Deployment might be a manual or automated process depending on the development tools in use.
 
+## IIS Application Pools
+
+Sharing an app pool among ASP.NET Core apps isn't supported, including for Blazor apps. Use one app pool per app when hosting with IIS, and avoid the use of IIS's [virtual directories](/iis/get-started/planning-your-iis-architecture/understanding-sites-applications-and-virtual-directories-on-iis#virtual-directories) for hosting multiple apps.
+
+One or more Blazor WebAssembly apps hosted by an ASP.NET Core app, known as a [hosted Blazor WebAssembly solution](xref:blazor/hosting-models#blazor-webassembly), are supported for ***one*** app pool. However, we don't recommend or support assigning a single app pool to multiple hosted Blazor WebAssembly solutions or in sub-app hosting scenarios. For more information, see <xref:host-and-deploy/iis/advanced#sub-applications>.
+
 ## App base path
 
 The *app base path* is the app's root URL path. Consider the following ASP.NET Core app and Blazor sub-app:
@@ -350,6 +362,12 @@ Publish locations:
 
 The assets in the folder are deployed to the web server. Deployment might be a manual or automated process depending on the development tools in use.
 
+## IIS Application Pools
+
+Sharing an app pool among ASP.NET Core apps isn't supported, including for Blazor apps. Use one app pool per app when hosting with IIS, and avoid the use of IIS's [virtual directories](/iis/get-started/planning-your-iis-architecture/understanding-sites-applications-and-virtual-directories-on-iis#virtual-directories) for hosting multiple apps.
+
+One or more Blazor WebAssembly apps hosted by an ASP.NET Core app, known as a [hosted Blazor WebAssembly solution](xref:blazor/hosting-models#blazor-webassembly), are supported for ***one*** app pool. However, we don't recommend or support assigning a single app pool to multiple hosted Blazor WebAssembly solutions or in sub-app hosting scenarios. For more information, see <xref:host-and-deploy/iis/advanced#sub-applications>.
+
 ## App base path
 
 The *app base path* is the app's root URL path. Consider the following ASP.NET Core app and Blazor sub-app:

aspnetcore/host-and-deploy/iis/web-config.md

@@ -90,7 +90,7 @@ The <xref:System.Configuration.SectionInformation.InheritInChildApplications%2A>
 
 When an app is deployed to [Azure App Service](https://azure.microsoft.com/services/app-service/), the `stdoutLogFile` path is set to `\\?\%home%\LogFiles\stdout`. The path saves stdout logs to the `LogFiles` folder, which is a location automatically created by the service.
 
-For information on IIS sub-application configuration, see <xref:host-and-deploy/iis/index#sub-applications>.
+For information on IIS sub-application configuration, see <xref:host-and-deploy/iis/advanced#sub-applications>.
 
 ### Attributes of the `aspNetCore` element