import http from 'k6/http';
import { check } from 'k6';

// Настройки нагрузки:  
// 1. 50 пользователей за 30 сек  
// 2. Держим 100 пользователей минуту  
// 3. Плавно сбрасываем  
export let options = {
  stages: [
    { duration: '30s', target: 50 },
    { duration: '1m', target: 100 },
    { duration: '20s', target: 0 },
  ],
};

// Сам тест: дергаем API и проверяем, что отвечает 200  
export default function () {
  let res = http.get('https://api.example.com/data');
  check(res, { 'Status 200': (r) => r.status == 200 });
}

k6 run test.js

func helloHandler(w http.ResponseWriter, r *http.Request) {
 ctx, span := tracer.Start(r.Context(), "helloHandler")
 defer span.End()

 slogctx.Info(ctx, "starting long calculation...")
 /*
  {
   "time": "2023-11-17T03:11:20.584592-07:00",
   "level": "INFO",
   "msg": "starting long calculation...",
   "TraceID": "15715df45965b4a2db6dc103a76e52ae",
   "SpanID": "76d364cdd598c895"
  }
 */

 time.Sleep(5 * time.Second)
 slogctx.Error(ctx, "something failed...")
 /*
  {
   "time": "2023-11-17T03:11:25.586464-07:00",
   "level": "ERROR",
   "msg": "something failed...",
   "TraceID": "15715df45965b4a2db6dc103a76e52ae",
   "SpanID": "76d364cdd598c895"
  }
 */

 w.WriteHeader(http.StatusInternalServerError)

 // The OTEL exporter will soon after output the trace, which will include this and much more:
 /*
  {
   "Name": "helloHandler",
   "SpanContext": {
    "TraceID": "15715df45965b4a2db6dc103a76e52ae",
    "SpanID": "76d364cdd598c895"
   },
   "Status": {
    "Code": "Error",
    "Denoscription": "something failed..."
   }
  }
 */
}