How Do I Download Microsoft Pc Health Check

PC Health Check app brings you up to date info on your Windows device health, helping you take action to improve your device performance and troubleshoot performance problems. It is periodically updated based on customer feedback to help you make the most of your Windows PC.

Health checks are typically used with an external monitoring service or container orchestrator to check the status of an app. Before adding health checks to an app, decide on which monitoring system to use. The monitoring system dictates what types of health checks to create and how to configure their endpoints.

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The basic configuration registers health check services and calls the Health Checks Middleware to respond at a URL endpoint with a health response. By default, no specific health checks are registered to test any particular dependency or subsystem. The app is considered healthy if it can respond at the health endpoint URL. The default response writer writes HealthStatus as a plaintext response to the client. The HealthStatus is HealthStatus.Healthy, HealthStatus.Degraded, or HealthStatus.Unhealthy.

The preceding example uses curl to make an HTTP request to the health check endpoint at /healthz. curl isn't included in the .NET Linux container images, but it can be added by installing the required package in the Dockerfile. Containers that use images based on Alpine Linux can use the included wget in place of curl.

Health checks are created by implementing the IHealthCheck interface. The CheckHealthAsync method returns a HealthCheckResult that indicates the health as Healthy, Degraded, or Unhealthy. The result is written as a plaintext response with a configurable status code. Configuration is described in the Health check options section. HealthCheckResult can also return optional key-value pairs.

The health check's logic is placed in the CheckHealthAsync method. The preceding example sets a dummy variable, isHealthy, to true. If the value of isHealthy is set to false, the HealthCheckRegistration.FailureStatus status is returned.

If CheckHealthAsync throws an exception during the check, a new HealthReportEntry is returned with its HealthReportEntry.Status set to the FailureStatus. This status is defined by AddCheck (see the Register health check services section) and includes the inner exception that caused the check failure. The Description is set to the exception's message.

The AddCheck overload shown in the following example sets the failure status (HealthStatus) to report when the health check reports a failure. If the failure status is set to null (default), HealthStatus.Unhealthy is reported. This overload is a useful scenario for library authors, where the failure status indicated by the library is enforced by the app when a health check failure occurs if the health check implementation honors the setting.

Call RequireHost to specify one or more permitted hosts for the health check endpoint. Hosts should be Unicode rather than punycode and may include a port. If a collection isn't supplied, any host is accepted:

To restrict the health check endpoint to respond only on a specific port, specify a port in the call to RequireHost. This approach is typically used in a container environment to expose a port for monitoring services:

Call RequireAuthorization to run Authorization Middleware on the health check request endpoint. A RequireAuthorization overload accepts one or more authorization policies. If a policy isn't provided, the default authorization policy is used:

Although running health checks manually from a browser isn't a common scenario, CORS Middleware can be enabled by calling RequireCors on the health checks endpoints. The RequireCors overload accepts a CORS policy builder delegate (CorsPolicyBuilder) or a policy name. For more information, see Enable Cross-Origin Requests (CORS) in ASP.NET Core.

Use ResultStatusCodes to customize the mapping of health status to HTTP status codes. The following StatusCodes assignments are the default values used by the middleware. Change the status code values to meet your requirements:

The health checks API doesn't provide built-in support for complex JSON return formats because the format is specific to your choice of monitoring system. Customize the response in the preceding examples as needed. For more information on JSON serialization with System.Text.Json, see How to serialize and deserialize JSON in .NET.

AspNetCore.Diagnostics.HealthChecks, a health check library for ASP.NET Core apps, includes a health check that runs against a SQL Server database. AspNetCore.Diagnostics.HealthChecks executes a SELECT 1 query against the database to confirm the connection to the database is healthy.

When checking a database connection with a query, choose a query that returns quickly. The query approach runs the risk of overloading the database and degrading its performance. In most cases, running a test query isn't necessary. Merely making a successful connection to the database is sufficient. If you find it necessary to run a query, choose a simple SELECT query, such as SELECT 1.

AddDbContextCheck registers a health check for a DbContext. The DbContext is supplied to the method as the TContext. An overload is available to configure the failure status, tags, and a custom test query.

Consider the following example: An app must download a large configuration file before it's ready to process requests. We don't want the app to be restarted if the initial download fails because the app can retry downloading the file several times. We use a liveness probe to describe the liveness of the process, no other checks are run. We also want to prevent requests from being sent to the app before the configuration file download has succeeded. We use a readiness probe to indicate a "not ready" state until the download succeeds and the app is ready to receive requests.

The health check is registered with AddCheck in Program.cs along with the hosted service. Because the hosted service must set the property on the health check, the health check is also registered in the service container as a singleton:

Before the startup task completes, the /healthz/ready endpoint reports an Unhealthy status. Once the startup task completes, this endpoint reports a Healthy status. The /healthz/live endpoint excludes all checks and reports a Healthy status for all calls.

Using separate readiness and liveness checks is useful in an environment such as Kubernetes. In Kubernetes, an app might be required to run time-consuming startup work before accepting requests, such as a test of the underlying database availability. Using separate checks allows the orchestrator to distinguish whether the app is functioning but not yet ready or if the app has failed to start. For more information on readiness and liveness probes in Kubernetes, see Configure Liveness and Readiness Probes in the Kubernetes documentation.

Write a health check that implements the IHealthCheck interface as a standalone class. The class can rely on dependency injection (DI), type activation, and named options to access configuration data.

The preceding signature indicates that the health check requires custom data to process the health check probe logic. The data is provided to the delegate used to create the health check instance when the health check is registered with an extension method. In the following example, the caller specifies:

When an IHealthCheckPublisher is added to the service container, the health check system periodically executes your health checks and calls PublishAsync with the result. This process is useful in a push-based health monitoring system scenario that expects each process to call the monitoring system periodically to determine health.

The advantage of using MapHealthChecks over UseHealthChecks is the ability to use endpoint aware middleware, such as authorization, and to have greater fine-grained control over the matching policy. The primary advantage of using UseHealthChecks over MapHealthChecks is controlling exactly where health checks runs in the middleware pipeline.

The Microsoft.AspNetCore.Diagnostics.HealthChecks package is referenced implicitly for ASP.NET Core apps. To run health checks using Entity Framework Core, add a reference to the Microsoft.Extensions.Diagnostics.HealthChecks.EntityFrameworkCore package.

The sample app provides startup code to demonstrate health checks for several scenarios. The database probe scenario checks the health of a database connection using AspNetCore.Diagnostics.HealthChecks. The DbContext probe scenario checks a database using an EF Core DbContext. To explore the database scenarios, the sample app:

Another health check scenario demonstrates how to filter health checks to a management port. The sample app requires you to create a Properties/launchSettings.json file that includes the management URL and management port. For more information, see the Filter by port section.

The basic configuration registers health check services and calls the Health Checks Middleware to respond at a URL endpoint with a health response. By default, no specific health checks are registered to test any particular dependency or subsystem. The app is considered healthy if it can respond at the health endpoint URL. The default response writer writes the status (HealthStatus) as a plaintext response back to the client, indicating either a HealthStatus.Healthy, HealthStatus.Degraded, or HealthStatus.Unhealthy status.

Health checks are created by implementing the IHealthCheck interface. The CheckHealthAsync method returns a HealthCheckResult that indicates the health as Healthy, Degraded, or Unhealthy. The result is written as a plaintext response with a configurable status code (configuration is described in the Health check options section). HealthCheckResult can also return optional key-value pairs. ff782bc1db