ASP.NET Error and Performance Monitoring

Install-Package Sentry.AspNet

using System;
using System.Web;
using Sentry;
using Sentry.AspNet;
using Sentry.EntityFramework; // if you also installed Sentry.EntityFramework
using Sentry.Extensibility;

public class MvcApplication : HttpApplication
{
    private IDisposable _sentry;

    protected void Application_Start()
    {
        // Initialize Sentry to capture AppDomain unhandled exceptions and more.
        _sentry = SentrySdk.Init(o =>
        {
            o.AddAspNet();
            o.Dsn = "https://<key>@sentry.io/<project>";
            // When configuring for the first time, to see what the SDK is doing:
            o.Debug = true;
            // Set TracesSampleRate to 1.0 to capture 100%
            // of transactions for performance monitoring.
            // We recommend adjusting this value in production
            o.TracesSampleRate = 1.0;
            // if you also installed the Sentry.EntityFramework package
            o.AddEntityFramework();
        });
    }

    protected void Application_Error()
    {
        var exception = Server.GetLastError();
        SentrySdk.CaptureException(exception);
    }

    protected void Application_BeginRequest()
    {
        Context.StartSentryTransaction();
    }

    protected void Application_EndRequest()
    {
        Context.FinishSentryTransaction();
    }

    protected void Application_End()
    {
        // Flushes out events before shutting down.
        _sentry?.Dispose();
    }
}