AspNetCore.Mvc.Routes.DebuggingLoggerMiddleware 1.0.0

Add RouteDebuggingLogger to your AspNetCore app and behold in relieve as it explains to your Logger what routes AspNetCore.Mvc has identified.

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    if (env.IsDevelopment())
    {
        app
           .UseDeveloperExceptionPage()
           .UseMiddleware<RouteDebuggingLogger>();
    }
    app
       .UseMvcWithDefaultRoute()
       .UseComponentAsService()
       .UseKitchenSink();
}

Example output:

info: AspNetCore.Mvc.Routes.DebuggingLoggerMiddleware.RouteDebuggingLogger[0]
      Microsoft.AspNetCore.Mvc.Internal.ActionDescriptorCollectionProvider.ActionDescriptors.Version=0. Actions.Count=13
info: AspNetCore.Mvc.Routes.DebuggingLoggerMiddleware.RouteDebuggingLogger[0]
      Action: Example.AspNetCore.Empty.HomeController.Index (Example.AspNetCore.Minimal) Microsoft.AspNetCore.Mvc.Controllers.ControllerActionDescriptor
      Constraints: null
      AttributeRouteInfo : 
      BoundProperties : []
      FilterDescriptors : [{"FilterType":"Microsoft.AspNetCore.Mvc.Internal.ControllerActionFilter","Order":-2147483648,"Scope":20},{"FilterType":"Microsoft.AspNetCore.Mvc.ViewFeatures.SaveTempDataAttribute","Order":-2147483548,"Scope":10},{"FilterType":"Microsoft.AspNetCore.Mvc.ModelBinding.UnsupportedContentTypeFilter","Order":0,"Scope":10}]
      Parameters : []
      Properties : {}
      RouteValues : {"action":"Index","controller":"Home"}
      Cumulative timing in milliseconds to inspect and format each attribute: Name:0, Constraints:23, AttributeRouteInfo:23, BoundProperties:41, FilterDescriptors:60, Parameters:63, Properties:67, RouteValues:69

... etc ...

Set RouteDebuggingLogger.LogLevel if you must change the LogLevel.