dotnet add package Rollbar.NetCore.AspNet

//...
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;

using Rollbar;
using Rollbar.NetCore.AspNet;
//...

public class Startup
{
	//...
  
  public void ConfigureServices(IServiceCollection services)
  {
    // STEP.1 - enable Http Context Accessor:
    services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();

    // STEP.2 - Setup Rollbar Infrastructure:
    ConfigureRollbarInfrastructure();

    // STEP.3 - Add Rollbar logger with properly configured log level filter:
    services.AddRollbarLogger(loggerOptions =>
     {
       loggerOptions.Filter = 
         (loggerName, loglevel) => loglevel >= LogLevel.Trace;
     });

    services.AddRazorPages();
    services.AddServerSideBlazor();
    services.AddSingleton<WeatherForecastService>();
  }

  public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
  {
    if(env.IsDevelopment())
    {
      app.UseDeveloperExceptionPage();
    }
    else
    {
      app.UseExceptionHandler("/Error");
      // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
      app.UseHsts();
    }

    // STEP.4 - Use Rollbar middleware:
    app.UseRollbarMiddleware();
    // Any other middleware component intended to be "monitored" by Rollbar middleware
    // go below this line:

    app.UseHttpsRedirection();
    app.UseStaticFiles();

    app.UseRouting();

    app.UseEndpoints(endpoints =>
    {
      endpoints.MapBlazorHub();
      endpoints.MapFallbackToPage("/_Host");
    });
  }

  // STEP.2 - Setup Rollbar Infrastructure:
  private void ConfigureRollbarInfrastructure()
  {
    RollbarInfrastructureConfig config = new RollbarInfrastructureConfig(
      RollbarSamplesSettings.AccessToken,
      RollbarSamplesSettings.Environment
    );
    RollbarDataSecurityOptions dataSecurityOptions = new RollbarDataSecurityOptions();
    dataSecurityOptions.ScrubFields = new string[]
    {
      "url",
      "method",
    };
    config.RollbarLoggerConfig.RollbarDataSecurityOptions.Reconfigure(dataSecurityOptions);

    RollbarInfrastructure.Instance.Init(config);

    // Optionally:
    RollbarInfrastructure.Instance.QueueController.InternalEvent += OnRollbarInternalEvent;
  }

  // STEP.2 - Setup Rollbar Infrastructure:
  private static void OnRollbarInternalEvent(object sender, RollbarEventArgs e)
  {
    Console.WriteLine(e.TraceAsString());

    RollbarApiErrorEventArgs apiErrorEvent = e as RollbarApiErrorEventArgs;
    if(apiErrorEvent != null)
    {
      //TODO: handle/report Rollbar API communication error event...
      return;
    }
    CommunicationEventArgs commEvent = e as CommunicationEventArgs;
    if(commEvent != null)
    {
      //TODO: handle/report Rollbar API communication event...
      return;
    }
    CommunicationErrorEventArgs commErrorEvent = e as CommunicationErrorEventArgs;
    if(commErrorEvent != null)
    {
      //TODO: handle/report basic communication error while attempting to reach Rollbar API service... 
      return;
    }
    InternalErrorEventArgs internalErrorEvent = e as InternalErrorEventArgs;
    if(internalErrorEvent != null)
    {
      //TODO: handle/report basic internal error while using the Rollbar Notifier... 
      return;
    }

  }  

}