如何在.Net框架4.6.1中使用OwinStartup.cs中的普罗米修斯计数器和度量

using Owin;
using Prometheus;

public class OwinStartup
{
    public void Configuration(IAppBuilder app)
    {
        // 注册Prometheus中间件
        app.UsePrometheusServer();

        // 添加自定义的普罗米修斯计数器和度量
        var counter = Metrics.CreateCounter("my_counter", "My custom counter");
        var gauge = Metrics.CreateGauge("my_gauge", "My custom gauge");

        // 在需要的地方增加计数器和度量的值
        counter.Inc();
        gauge.Set(10);
    }
}

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    // ...

    // 注册OwinStartup类
    app.Use(typeof(OwinStartup));

    // ...
}