feat: add service discovery, OTel instrumentation, and k6 load tests (#1)

k6/load-test.js

@@ -0,0 +1,36 @@
+// FALLBACK k6 load-test script.
+// This static skeleton is only used when The Watcher agent fails to generate
+// a bespoke k6 script tailored to the application's detected HTTP endpoints.
+// When generation succeeds, the agent produces a custom script that replaces
+// this file in the scaffolded output repository.
+import http from 'k6/http';
+import { check, sleep } from 'k6';
+
+export const options = {
+  scenarios: {
+    load_test: {
+      executor: 'ramping-vus',
+      startVUs: 0,
+      stages: [
+        { duration: '${{ values.k6_ramp_up | default("10s") }}', target: ${{ values.k6_virtual_users | default(10) }} },
+        { duration: '${{ values.k6_duration | default("30s") }}', target: ${{ values.k6_virtual_users | default(10) }} },
+        { duration: '5s', target: 0 },
+      ],
+    },
+  },
+  thresholds: {
+    http_req_duration: ['p(95)<500'],
+    http_req_failed: ['rate<0.01'],
+  },
+};
+
+const BASE_URL = `http://${{ values.frontend_service_name | default("frontend") }}.${{ values.destination_namespace }}.svc.cluster.local:${{ values.frontend_service_port | default(80) }}`;
+
+export default function () {
+  const res = http.get(`${BASE_URL}${{ values.k6_target_path | default("/") }}`);
+  check(res, {
+    'status is 200': (r) => r.status === 200,
+    'response time < 500ms': (r) => r.timings.duration < 500,
+  });
+  sleep(0.5);
+}

k6/testrun.yaml

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+# FALLBACK k6 TestRun CRD — reference template for load testing ${{ values.component_id }}.
+# This static skeleton is only used when The Watcher agent fails to generate
+# a bespoke k6 script. When generation succeeds, the agent produces a custom
+# TestRun CRD that replaces this file in the scaffolded output repository.
+#
+# TestRun CRDs are committed to the repo as a reference. They are created
+# dynamically from Backstage (not auto-synced by ArgoCD) because they are
+# ephemeral one-shot resources.
+apiVersion: k6.io/v1alpha1
+kind: TestRun
+metadata:
+  name: k6-${{ values.component_id }}
+  namespace: ${{ values.destination_namespace }}
+  labels:
+    app: ${{ values.component_id }}
+    backstage.io/component: ${{ values.component_id }}
+    app.kubernetes.io/managed-by: backstage
+    app.kubernetes.io/component: load-testing
+spec:
+  parallelism: 1
+  script:
+    configMap:
+      name: k6-test-${{ values.component_id }}
+      file: load-test.js
+  runner:
+    image: grafana/k6:latest
+    envFrom:
+      - configMapRef:
+          name: k6-test-${{ values.component_id }}
+    env:
+      - name: K6_OTEL_SERVICE_NAME
+        value: k6-${{ values.component_id }}
+      - name: TEST_VUS
+        value: "10"
+      - name: TEST_DURATION
+        value: "30s"