Add Identity metrics documentation for .NET 10

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

Author: Copilot

aspnetcore/log-mon/metrics/metrics.md

@@ -1,10 +1,11 @@
 ---
 title: ASP.NET Core metrics
-description: Metrics for ASP.NET Core apps
+ai-usage: ai-assisted
 author: tdykstra
-ms.author: tdykstra
+description: Metrics for ASP.NET Core apps
 monikerRange: '>= aspnetcore-8.0'
-ms.date: 10/18/2023
+ms.author: tdykstra
+ms.date: 11/10/2025
 ms.topic: article
 uid: log-mon/metrics/metrics
 ---
@@ -262,6 +263,47 @@ The proceeding test:
 * Makes an HTTP request to the web app.
 * Asserts the test using results from the metrics collector.
 
+:::moniker range=">= aspnetcore-10.0"
+
+## ASP.NET Core Identity metrics
+
+ASP.NET Core Identity observability has been improved in .NET 10 with metrics. These metrics help you monitor user management activities and authentication processes.
+
+The metrics are in the `Microsoft.AspNetCore.Identity` meter and include:
+
+### User management metrics
+
+* `aspnetcore.identity.user.create.duration` - Measures the duration of user creation operations
+* `aspnetcore.identity.user.update.duration` - Measures the duration of user update operations
+* `aspnetcore.identity.user.delete.duration` - Measures the duration of user deletion operations
+* `aspnetcore.identity.user.check_password_attempts` - Counts password verification attempts
+* `aspnetcore.identity.user.generated_tokens` - Counts tokens generated for users (like password reset tokens)
+* `aspnetcore.identity.user.verify_token_attempts` - Counts token verification attempts
+
+### Authentication metrics
+
+* `aspnetcore.identity.sign_in.authenticate.duration` - Measures the duration of authentication operations
+* `aspnetcore.identity.sign_in.check_password_attempts` - Counts password check attempts during sign-in
+* `aspnetcore.identity.sign_in.sign_ins` - Counts successful sign-ins
+* `aspnetcore.identity.sign_in.sign_outs` - Counts sign-outs
+* `aspnetcore.identity.sign_in.two_factor_clients_remembered` - Counts remembered two-factor clients
+* `aspnetcore.identity.sign_in.two_factor_clients_forgotten` - Counts forgotten two-factor clients
+
+These metrics can be used to:
+
+* Monitor user registration and management
+* Track authentication patterns and potential security issues
+* Measure performance of Identity operations
+* Observe two-factor authentication usage
+
+You can view these metrics using the techniques described earlier in this article, such as `dotnet-counters` or Prometheus with Grafana.
+
+```dotnetcli
+dotnet-counters monitor -n YourAppName --counters Microsoft.AspNetCore.Identity
+```
+
+:::moniker-end
+
 ## ASP.NET Core meters and counters
 
 See [ASP.NET Core metrics](/dotnet/core/diagnostics/built-in-metrics-aspnetcore) for a list of ASP.NET Core meters and counters.

aspnetcore/security/authentication/identity.md

@@ -1,10 +1,11 @@
 ---
 title: Introduction to Identity on ASP.NET Core
+ai-usage: ai-assisted
 author: wadepickett
 description: Use Identity with an ASP.NET Core app. Learn how to set password requirements (RequireDigit, RequiredLength, RequiredUniqueChars, and more).
 monikerRange: '>= aspnetcore-3.0'
 ms.author: wpickett
-ms.date: 10/30/2025
+ms.date: 11/10/2025
 uid: security/authentication/identity
 ---
 # Introduction to Identity on ASP.NET Core
@@ -202,6 +203,16 @@ The template-generated app doesn't use [authorization](xref:security/authorizati
 
 For more information on `IdentityOptions`, see <xref:Microsoft.AspNetCore.Identity.IdentityOptions> and [Application Startup](xref:fundamentals/startup).
 
+:::moniker range=">= aspnetcore-10.0"
+
+## ASP.NET Core Identity metrics
+
+ASP.NET Core Identity metrics provide monitoring capabilities for user management and authentication processes. These metrics help you detect unusual sign-in patterns that might indicate security threats, track the performance of identity operations, and understand how users interact with authentication features such as two-factor authentication. This observability is particularly valuable for applications with strict security requirements or those experiencing high authentication traffic. The ASP.NET Core Identity metrics were introduced in .NET 10.
+
+For complete details on available metrics and how to use them, see <xref:log-mon/metrics/metrics#aspnet-core-identity-metrics>.
+
+:::moniker-end
+
 <!-- Start here for .NET 6 -->
 
 ## Scaffold Register, Login, LogOut, and RegisterConfirmation