Question

我想在asp.net核心Web API应用程序上从AppMetrics库应用运行状况检查。我尝试了多种方法，但没有成功。

在Program.cs

public static IWebHost BuildWebHost(string[] args) =>
        WebHost.CreateDefaultBuilder(args)
            .UseHealth()
            .UseStartup<Startup>()
            .Build();

在Startup.cs

public void ConfigureServices(IServiceCollection services)
    {
        services.AddSingleton<HealthCheck, SampleHealthCheck>();

        var metrics = new HealthBuilder()
            .HealthChecks.AddCheck(new SampleHealthCheck())
            .HealthChecks.AddCheck("DatabaseConnected", 
                () => new ValueTask<HealthCheckResult>(HealthCheckResult.Healthy("Database Connection OK")))
            .HealthChecks.RegisterFromAssembly(services)
            .Build();

        services.AddHealth(metrics);
        services.AddHealthEndpoints();
        services.AddMvc();
    }

    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }

        app.UseHealthAllEndpoints();
        app.UseMvc();
    }

我仍然收到的错误如下：

    System.Reflection.ReflectionTypeLoadException: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.
  at at System.Reflection.RuntimeModule.GetTypes(RuntimeModule module)
  at at System.Reflection.RuntimeModule.GetDefinedTypes()
  at at System.Reflection.RuntimeAssembly.get_DefinedTypes()
  at App.Metrics.Health.Extensions.DependencyInjection.Internal.DefaultHealthCheckTypeProvider.<>c.<get_HealthCheckTypes>b__5_0(Assembly a) in C:\projects\microsoftextensions\src\App.Metrics.Health.Extensions.DependencyInjection\Internal\DefaultHealthCheckTypeProvider.cs:25
  at at System.Linq.Enumerable.SelectManySingleSelectorIterator`2.MoveNext()
  at at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
  at App.Metrics.Health.Extensions.DependencyInjection.Internal.HealthChecksAsServices.AddHealthChecksAsServices(IServiceCollection services, IEnumerable`1 types) in C:\projects\microsoftextensions\src\App.Metrics.Health.Extensions.DependencyInjection\Internal\HealthChecksAsServices.cs:27
  at App.Metrics.Health.Extensions.DependencyInjection.Internal.HealthChecksAsServices.AddHealthChecksAsServices(IServiceCollection services, IEnumerable`1 assemblies) in C:\projects\microsoftextensions\src\App.Metrics.Health.Extensions.DependencyInjection\Internal\HealthChecksAsServices.cs:53
  at Microsoft.Extensions.DependencyInjection.ServiceCollectionHealthCheckBuilderExtensions.RegisterFromAssembly(IHealthCheckBuilder healthCheckBuilder, IServiceCollection services, DependencyContext dependencyContext) in C:\projects\microsoftextensions\src\App.Metrics.Health.Extensions.DependencyInjection\ServiceCollectionHealthCheckBuilderExtensions.cs:34
  at Microsoft.AspNetCore.Hosting.HealthAspNetWebHostBuilderExtensions.<>c__DisplayClass5_0.<ConfigureHealth>b__0(WebHostBuilderContext context, IServiceCollection services) in C:\projects\aspnetcorehealth\src\App.Metrics.AspNetCore.Health.Hosting\HealthAspNetWebHostBuilderExtensions.cs:113
  at at Microsoft.AspNetCore.Hosting.WebHostBuilder.BuildCommonServices(AggregateException& hostingStartupErrors)
  at at Microsoft.AspNetCore.Hosting.WebHostBuilder.Build()
  at WebApiAppMetrics.Program.BuildWebHost(String[] args) in C:\DEV\AspnetWebApiAppMetricsPlayground\AspnetWebApiAppMetricsPlayground\WebApiAppMetrics\Program.cs:24
  at WebApiAppMetrics.Program.Main(String[] args) in D:\_TEST_\AspnetWebApiAppMetricsPlayground\AspnetWebApiAppMetricsPlayground\WebApiAppMetrics\Program.cs:20

Answer 1

请按照以下步骤操作演示：

创建一个.Net Core 2.1 Web项目
安装软件包App.Metrics.AspNetCore.Health

Program.cs

public class Program
{
    public static void Main(string[] args)
    {
        CreateWebHostBuilder(args).Build().Run();
    }

    public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
        WebHost.CreateDefaultBuilder(args)
        .ConfigureHealthWithDefaults(
            builder =>
            {
                builder.HealthChecks.AddCheck("DatabaseConnected",
            () => new ValueTask<HealthCheckResult>(HealthCheckResult.Healthy("Database Connection OK")));
            })
            .UseHealth()
            .UseStartup<Startup>();
}

访问https://localhost:44343/health以检查结果。

对于App.Metrics.AspNetCore.Health和UseHealth()，它会自动扫描执行程序集以及依赖于App.Metrics。*的任何引用程序集，以进行运行状况检查并注册它们

对于SampleHealthCheck，如果您继承自HealthCheck，则无需显式注册。 AppMetrics将为您注册。

引用HEALTH

asp.net核心网络API中的AppMetrics健康检查

1 个答案: