feat(k6): add bespoke load test files

.gitignore

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+bin/
+*.exe
+*.test
+.DS_Store
+vendor/

Dockerfile

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+# ---- Build stage ----
+FROM golang:1.22-alpine AS build
+WORKDIR /src
+
+COPY go.mod go.sum* ./
+RUN go mod tidy && go mod download
+
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux go build -trimpath -ldflags="-s -w" -o /app .
+
+# ---- Runtime stage (distroless) ----
+FROM gcr.io/distroless/static-debian12:nonroot
+COPY --from=build /app /app
+
+EXPOSE 8080
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
+    CMD ["/app", "-health-check"] 
+
+ENTRYPOINT ["/app"]

go.mod

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+module github.com/kyndryl-platform/sonar-test-go
+
+go 1.22
+
+require (
+	github.com/prometheus/client_golang v1.19.1
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.52.0
+	go.opentelemetry.io/otel v1.27.0
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp v1.27.0
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.27.0
+	go.opentelemetry.io/otel/sdk v1.27.0
+	go.opentelemetry.io/otel/sdk/metric v1.27.0
+)

k6/configmap.yaml

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+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: k6-test-sonar-test-go
+  namespace: dev
+  labels:
+    app: sonar-test-go
+    app.kubernetes.io/managed-by: backstage
+    app.kubernetes.io/component: load-testing
+data:
+  K6_OUT: opentelemetry
+  K6_OTEL_GRPC_EXPORTER_INSECURE: 'true'
+  K6_OTEL_GRPC_EXPORTER_ENDPOINT: otel-collector.monitoring.svc.cluster.local:4317
+  K6_OTEL_METRIC_PREFIX: k6_
+  K6_OTEL_FLUSH_INTERVAL: '1000'
+  K6_OTEL_EXPORT_INTERVAL: '5000'
+  K6_OTEL_SERVICE_NAME: k6-sonar-test-go
+  load-test.js: "import http from 'k6/http';\nimport { check, sleep, group } from\
+    \ 'k6';\n\nconst vus = parseInt(__ENV.TEST_VUS || '10');\nconst duration = __ENV.TEST_DURATION\
+    \ || '30s';\nconst targetUrl = __ENV.TARGET_URL || 'http://sonar-test-go.dev.svc.cluster.local:8080';\n\
+    \nexport const options = {\n  scenarios: {\n    load_test: {\n      executor:\
+    \ 'ramping-vus',\n      startVUs: 0,\n      stages: [\n        { duration: '10s',\
+    \ target: vus },\n        { duration: duration, target: vus },\n        { duration:\
+    \ '5s', target: 0 },\n      ],\n    },\n  },\n  thresholds: {\n    http_req_duration:\
+    \ ['p(95)<500'],\n    http_req_failed: ['rate<0.01'],\n  },\n};\n\nhttp.setResponseCallback(http.expectedStatuses({\
+    \ min: 200, max: 399 }));\n\nexport default function () {\n  group('Health Check',\
+    \ () => {\n    const res = http.get(`${targetUrl}/health`);\n    check(res, {\n\
+    \      'status is 200': (r) => r.status === 200,\n      'response time < 500ms':\
+    \ (r) => r.timings.duration < 500,\n      'body contains status UP': (r) => r.json().status\
+    \ === 'UP',\n    });\n  });\n\n  sleep(0.5);\n\n  group('Items API', () => {\n\
+    \    // List all items\n    const listRes = http.get(`${targetUrl}/api/items`);\n\
+    \    check(listRes, {\n      'status is 200': (r) => r.status === 200,\n     \
+    \ 'response time < 500ms': (r) => r.timings.duration < 500,\n      'body is an\
+    \ array': (r) => Array.isArray(r.json()),\n    });\n\n    // Create a new item\n\
+    \    const createRes = http.post(\n      `${targetUrl}/api/items`,\n      JSON.stringify({\
+    \ name: 'Test Item', description: 'This is a test item.' }),\n      { headers:\
+    \ { 'Content-Type': 'application/json' } }\n    );\n    check(createRes, {\n \
+    \     'status is 201': (r) => r.status === 201,\n      'response time < 500ms':\
+    \ (r) => r.timings.duration < 500,\n      'body contains id': (r) => r.json().id\
+    \ !== undefined,\n    });\n\n    const itemId = createRes.json().id;\n\n    //\
+    \ Get item by ID\n    const getRes = http.get(`${targetUrl}/api/items/${itemId}`);\n\
+    \    check(getRes, {\n      'status is 200': (r) => r.status === 200,\n      'response\
+    \ time < 500ms': (r) => r.timings.duration < 500,\n      'body contains correct\
+    \ id': (r) => r.json().id === itemId,\n    });\n\n    // Update item by ID\n \
+    \   const updateRes = http.put(\n      `${targetUrl}/api/items/${itemId}`,\n \
+    \     JSON.stringify({ name: 'Updated Item', description: 'Updated description.'\
+    \ }),\n      { headers: { 'Content-Type': 'application/json' } }\n    );\n   \
+    \ check(updateRes, {\n      'status is 200': (r) => r.status === 200,\n      'response\
+    \ time < 500ms': (r) => r.timings.duration < 500,\n      'body contains updated\
+    \ name': (r) => r.json().name === 'Updated Item',\n    });\n\n    // Delete item\
+    \ by ID\n    const deleteRes = http.del(`${targetUrl}/api/items/${itemId}`);\n\
+    \    check(deleteRes, {\n      'status is 200': (r) => r.status === 200,\n   \
+    \   'response time < 500ms': (r) => r.timings.duration < 500,\n      'body contains\
+    \ deleted id': (r) => r.json().deleted === itemId,\n    });\n  });\n\n  sleep(0.5);\n\
+    }"

k6/load-test.js

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+import http from 'k6/http';
+import { check, sleep, group } from 'k6';
+
+const vus = parseInt(__ENV.TEST_VUS || '10');
+const duration = __ENV.TEST_DURATION || '30s';
+const targetUrl = __ENV.TARGET_URL || 'http://sonar-test-go.dev.svc.cluster.local:8080';
+
+export const options = {
+  scenarios: {
+    load_test: {
+      executor: 'ramping-vus',
+      startVUs: 0,
+      stages: [
+        { duration: '10s', target: vus },
+        { duration: duration, target: vus },
+        { duration: '5s', target: 0 },
+      ],
+    },
+  },
+  thresholds: {
+    http_req_duration: ['p(95)<500'],
+    http_req_failed: ['rate<0.01'],
+  },
+};
+
+http.setResponseCallback(http.expectedStatuses({ min: 200, max: 399 }));
+
+export default function () {
+  group('Health Check', () => {
+    const res = http.get(`${targetUrl}/health`);
+    check(res, {
+      'status is 200': (r) => r.status === 200,
+      'response time < 500ms': (r) => r.timings.duration < 500,
+      'body contains status UP': (r) => r.json().status === 'UP',
+    });
+  });
+
+  sleep(0.5);
+
+  group('Items API', () => {
+    // List all items
+    const listRes = http.get(`${targetUrl}/api/items`);
+    check(listRes, {
+      'status is 200': (r) => r.status === 200,
+      'response time < 500ms': (r) => r.timings.duration < 500,
+      'body is an array': (r) => Array.isArray(r.json()),
+    });
+
+    // Create a new item
+    const createRes = http.post(
+      `${targetUrl}/api/items`,
+      JSON.stringify({ name: 'Test Item', description: 'This is a test item.' }),
+      { headers: { 'Content-Type': 'application/json' } }
+    );
+    check(createRes, {
+      'status is 201': (r) => r.status === 201,
+      'response time < 500ms': (r) => r.timings.duration < 500,
+      'body contains id': (r) => r.json().id !== undefined,
+    });
+
+    const itemId = createRes.json().id;
+
+    // Get item by ID
+    const getRes = http.get(`${targetUrl}/api/items/${itemId}`);
+    check(getRes, {
+      'status is 200': (r) => r.status === 200,
+      'response time < 500ms': (r) => r.timings.duration < 500,
+      'body contains correct id': (r) => r.json().id === itemId,
+    });
+
+    // Update item by ID
+    const updateRes = http.put(
+      `${targetUrl}/api/items/${itemId}`,
+      JSON.stringify({ name: 'Updated Item', description: 'Updated description.' }),
+      { headers: { 'Content-Type': 'application/json' } }
+    );
+    check(updateRes, {
+      'status is 200': (r) => r.status === 200,
+      'response time < 500ms': (r) => r.timings.duration < 500,
+      'body contains updated name': (r) => r.json().name === 'Updated Item',
+    });
+
+    // Delete item by ID
+    const deleteRes = http.del(`${targetUrl}/api/items/${itemId}`);
+    check(deleteRes, {
+      'status is 200': (r) => r.status === 200,
+      'response time < 500ms': (r) => r.timings.duration < 500,
+      'body contains deleted id': (r) => r.json().deleted === itemId,
+    });
+  });
+
+  sleep(0.5);
+}

k6/testrun.yaml

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+apiVersion: k6.io/v1alpha1
+kind: TestRun
+metadata:
+  name: k6-sonar-test-go
+  namespace: dev
+  labels:
+    app: sonar-test-go
+    backstage.io/component: sonar-test-go
+    app.kubernetes.io/managed-by: backstage
+    app.kubernetes.io/component: load-testing
+spec:
+  parallelism: 1
+  script:
+    configMap:
+      name: k6-test-sonar-test-go
+      file: load-test.js
+  runner:
+    image: grafana/k6:latest
+    envFrom:
+    - configMapRef:
+        name: k6-test-sonar-test-go
+    env:
+    - name: K6_OTEL_SERVICE_NAME
+      value: k6-sonar-test-go

main.go

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+package main
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"strconv"
+	"strings"
+	"sync"
+	"sync/atomic"
+
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
+	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp"
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
+	"go.opentelemetry.io/otel/propagation"
+	sdkmetric "go.opentelemetry.io/otel/sdk/metric"
+	"go.opentelemetry.io/otel/sdk/resource"
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
+	semconv "go.opentelemetry.io/otel/semconv/v1.24.0"
+)
+
+// ---------------------------------------------------------------------------
+// Domain model
+// ---------------------------------------------------------------------------
+
+type Item struct {
+	ID          int    `json:"id"`
+	Name        string `json:"name"`
+	Description string `json:"description"`
+}
+
+type ItemRequest struct {
+	Name        string `json:"name"`
+	Description string `json:"description"`
+}
+
+// ---------------------------------------------------------------------------
+// In-memory store
+// ---------------------------------------------------------------------------
+
+var (
+	store   sync.Map
+	counter atomic.Int64
+)
+
+func nextID() int {
+	return int(counter.Add(1))
+}
+
+// ---------------------------------------------------------------------------
+// Helpers
+// ---------------------------------------------------------------------------
+
+func writeJSON(w http.ResponseWriter, status int, v any) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(status)
+	_ = json.NewEncoder(w).Encode(v)
+}
+
+func itemIDFromPath(path string) (int, bool) {
+	parts := strings.Split(strings.TrimSuffix(path, "/"), "/")
+	if len(parts) < 3 {
+		return 0, false
+	}
+	id, err := strconv.Atoi(parts[len(parts)-1])
+	return id, err == nil
+}
+
+// ---------------------------------------------------------------------------
+// Handlers
+// ---------------------------------------------------------------------------
+
+func healthHandler(w http.ResponseWriter, _ *http.Request) {
+	writeJSON(w, http.StatusOK, map[string]string{"status": "UP"})
+}
+
+func itemsHandler(w http.ResponseWriter, r *http.Request) {
+	// Route: /api/items  or  /api/items/{id}
+	hasSub := strings.Count(strings.TrimSuffix(r.URL.Path, "/"), "/") >= 3
+
+	if hasSub {
+		id, ok := itemIDFromPath(r.URL.Path)
+		if !ok {
+			writeJSON(w, http.StatusBadRequest, map[string]string{"error": "invalid id"})
+			return
+		}
+		switch r.Method {
+		case http.MethodGet:
+			v, exists := store.Load(id)
+			if !exists {
+				writeJSON(w, http.StatusNotFound, map[string]string{"error": "not found"})
+				return
+			}
+			writeJSON(w, http.StatusOK, v)
+		case http.MethodPut:
+			var req ItemRequest
+			if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+				writeJSON(w, http.StatusBadRequest, map[string]string{"error": err.Error()})
+				return
+			}
+			existingRaw, exists := store.Load(id)
+			if !exists {
+				writeJSON(w, http.StatusNotFound, map[string]string{"error": "not found"})
+				return
+			}
+			existing := existingRaw.(Item)
+			if req.Name == "" {
+				req.Name = existing.Name
+			}
+			if req.Description == "" {
+				req.Description = existing.Description
+			}
+			updated := Item{ID: id, Name: req.Name, Description: req.Description}
+			store.Store(id, updated)
+			writeJSON(w, http.StatusOK, updated)
+		case http.MethodDelete:
+			store.Delete(id)
+			writeJSON(w, http.StatusOK, map[string]int{"deleted": id})
+		default:
+			w.WriteHeader(http.StatusMethodNotAllowed)
+		}
+		return
+	}
+
+	// /api/items — list or create
+	switch r.Method {
+	case http.MethodGet:
+		var items []Item
+		store.Range(func(_, v any) bool {
+			items = append(items, v.(Item))
+			return true
+		})
+		if items == nil {
+			items = []Item{}
+		}
+		writeJSON(w, http.StatusOK, items)
+	case http.MethodPost:
+		var req ItemRequest
+		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+			writeJSON(w, http.StatusBadRequest, map[string]string{"error": err.Error()})
+			return
+		}
+		if req.Name == "" {
+			req.Name = "unnamed"
+		}
+		item := Item{ID: nextID(), Name: req.Name, Description: req.Description}
+		store.Store(item.ID, item)
+		writeJSON(w, http.StatusCreated, item)
+	default:
+		w.WriteHeader(http.StatusMethodNotAllowed)
+	}
+}
+
+// ---------------------------------------------------------------------------
+// OpenTelemetry setup
+// ---------------------------------------------------------------------------
+
+// setupOTel initialises the OTLP trace and metric pipelines from OTEL_* env
+// vars (injected by score.yaml / Humanitec). Returns a no-op shutdown func
+// when OTEL_EXPORTER_OTLP_ENDPOINT is not set (local dev).
+func setupOTel(ctx context.Context) func() {
+	if os.Getenv("OTEL_EXPORTER_OTLP_ENDPOINT") == "" {
+		return func() {}
+	}
+	svcName := os.Getenv("OTEL_SERVICE_NAME")
+	if svcName == "" {
+		svcName = "unknown"
+	}
+	res, _ := resource.New(ctx,
+		resource.WithAttributes(semconv.ServiceName(svcName)),
+		resource.WithFromEnv(),
+	)
+	traceExp, _ := otlptracehttp.New(ctx)
+	tp := sdktrace.NewTracerProvider(sdktrace.WithBatcher(traceExp), sdktrace.WithResource(res))
+	otel.SetTracerProvider(tp)
+	otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(
+		propagation.TraceContext{}, propagation.Baggage{},
+	))
+	metricExp, _ := otlpmetrichttp.New(ctx)
+	mp := sdkmetric.NewMeterProvider(
+		sdkmetric.WithReader(sdkmetric.NewPeriodicReader(metricExp)),
+		sdkmetric.WithResource(res),
+	)
+	otel.SetMeterProvider(mp)
+	return func() {
+		_ = tp.Shutdown(context.Background())
+		_ = mp.Shutdown(context.Background())
+	}
+}
+
+// ---------------------------------------------------------------------------
+// Main
+// ---------------------------------------------------------------------------
+
+func main() {
+	ctx := context.Background()
+	shutdownOTel := setupOTel(ctx)
+	defer shutdownOTel()
+
+	mux := http.NewServeMux()
+
+	mux.HandleFunc("/health", healthHandler)
+	mux.Handle("/metrics", promhttp.Handler())
+	mux.HandleFunc("/api/items/", itemsHandler)
+	mux.HandleFunc("/api/items", itemsHandler)
+
+	addr := ":8080"
+	fmt.Printf("sonar-test-go listening on %s\n", addr)
+	log.Fatal(http.ListenAndServe(addr, otelhttp.NewHandler(mux, "")))
+}

main_test.go

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+package main
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestHealth(t *testing.T) {
+	req := httptest.NewRequest(http.MethodGet, "/health", nil)
+	rec := httptest.NewRecorder()
+	healthHandler(rec, req)
+	if rec.Code != http.StatusOK {
+		t.Fatalf("expected 200, got %d", rec.Code)
+	}
+}