docker run -d -p 6831:6831/udp -p 6832:6832/udp -p 14268:14268 -p 14250:14250 -p 16686:16686 -p 5778:5778  
--name jaeger jaegertracing/all-in-one:latest

    public async Task<ApiResult<Models.User>> AddUserAsync(string username)
        {

            var result = new ApiResult<Models.User>();
            
            var user = await _applicationDbContext.Users.FirstOrDefaultAsync(x => x.Login == username);

            if (user is null)
            {
                try
                {
                    var url = string.Format(_appConfig.Github.ProfileUrl, username);
                    var apiResult = await _httpClient.GetStringAsync(url);
                    var userDto = JsonSerializer.Deserialize<UserDto>(apiResult);
                    user = _mapper.Map<Models.User>(userDto);
                    await _applicationDbContext.Users.AddAsync(user);
                    await _applicationDbContext.SaveChangesAsync();
                    result.Result = user;
                    result.Message = "User successfully Created";
                    return result;
                }
                catch (Exception e)
                {
                    result.Message = "User not found";
                    return result;
                }
            }

            result.Message = "User already exist";
            result.Result = user;

            return result;

        }

"JaegerConfig": {
    "Host": "localhost",
    "Port": 6831,
    "IsEnabled": true,
  "SamplingRate": 0.5
  }

 public static class Extensions
    {
        public static void AddJaeger(this IServiceCollection services, IConfiguration configuration)
        {
            var config = configuration.GetSection("JaegerConfig").Get<JaegerConfig>();
            
            if (!(config?.IsEnabled ?? false))
                return;

            if (string.IsNullOrEmpty(config?.Host))
                throw new Exception("invalid JaegerConfig");

            services.AddSingleton<ITracer>(serviceProvider =>
            {
                string serviceName = Assembly.GetEntryAssembly()?.GetName().Name;

                ILoggerFactory loggerFactory = serviceProvider.GetRequiredService<ILoggerFactory>();

                var sampler = new ProbabilisticSampler(config.SamplingRate); 

                var reporter = new RemoteReporter.Builder()
                    .WithLoggerFactory(loggerFactory)
                    .WithSender(new UdpSender(config.Host, config.Port, 0))
                    .WithFlushInterval(TimeSpan.FromSeconds(15))
                    .WithMaxQueueSize(300)
                    .Build();
                
                ITracer tracer = new Tracer.Builder(serviceName)
                    .WithLoggerFactory(loggerFactory)
                    .WithSampler(sampler)
                    .WithReporter(reporter)
                    .Build();

                GlobalTracer.Register(tracer);

                return tracer;
            });

            services.AddOpenTracing();
        }
    }

builder.Services.AddJaeger(builder.Configuration);

        private readonly IUserService _userService;
        private readonly ITracer _tracer;

        public UsersController(IUserService userService, ITracer tracer)
        {
            _userService = userService;
            _tracer = tracer;
        }

        [HttpPost]
        public async Task<ActionResult> AddUser(AddUserDto model)
        {
            var actionName = ControllerContext.ActionDescriptor.DisplayName;
            
            using var scope = _tracer.BuildSpan(actionName).StartActive(true);
            
            scope.Span.Log($"Add user log username: {model.Username}");
            
            return Ok(await _userService.AddUserAsync(model.Username));
        }