x789

// Mapping of .NET Activity Context to W3C TraceContext
var traceId = Activity.Current!.ParentId; // W3C 3.2.2.3 trace-id
var parentId = Activity.Current!.ParentSpanId; // W3C 3.2.2.4 parent-id
var spanId = Activity.Current!.SpanId; // This service's span-id. Will become parent-id of next call

x789

using System;
using Microsoft.AspNetCore.Mvc;

public class InvalidModelStateResponseFactory
{
    public static ProblemDetails Create(ActionContext _) => new();

    public class ProblemDetails : IActionResult
    {
        public Task ExecuteResultAsync(ActionContext context)