k6 Performance Pipeline

import http from 'k6/http';
import { check, sleep } from 'k6';
import { Rate, Trend } from 'k6/metrics';

const errorRate = new Rate('errors');
const responseTime = new Trend('response_time');

export const options = {
  stages: [
    { duration: '2m', target: 50 },
    { duration: '5m', target: 50 },
    { duration: '2m', target: 0 },
  ],
  thresholds: {
    http_req_duration: ['p(95)<500'],
    errors: ['rate<0.05'],
  },
};

export default function () {
  const res = http.get('http://app/health');
  const passed = check(res, {
    'status is 200': r => r.status === 200,
    'response < 300ms': r => r.timings.duration < 300,
  });
  errorRate.add(!passed);
  responseTime.add(res.timings.duration);
  sleep(1);
}

name: Performance Tests
on: [deployment_status]
jobs:
  perf:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - run: docker compose up -d
      - name: Run k6 smoke
        run: |
          docker compose run k6 run \
            --out prometheus \
            scripts/smoke.ts
      - name: Run k6 load
        run: |
          docker compose run k6 run \
            --out prometheus \
            scripts/load.ts
      - name: Validate SLOs
        run: python scripts/validate_slos.py
      - name: Publish dashboards
        uses: grafana/grafana-composite-action@v1
      - name: Comment PR
        uses: actions/github-script@v7
        with:
          script: |
            const report = require('./report.json')
            await github.rest.issues.createComment({
              ...context.repo,
              issue_number: context.issue.number,
              body: generatePerfComment(report),
            })