Add end-2-end tests for metrics service

Issue: COSI-46

.github/scripts/e2e_tests_metrics_service.sh

@@ -0,0 +1,60 @@
+#!/bin/bash
+set -e
+
+LOG_FILE=".github/e2e_tests/artifacts/logs/e2e_tests/metrics_service.log"
+mkdir -p "$(dirname "$LOG_FILE")"
+
+NAMESPACE="scality-object-storage"
+SERVICE="scality-cosi-metrics"
+LOCAL_PORT=8080
+TARGET_PORT=8080
+
+# Error handling function
+error_handler() {
+  echo "An error occurred during bucket creation tests. Check the log file for details." | tee -a "$LOG_FILE"
+  echo "Failed command: $BASH_COMMAND" | tee -a "$LOG_FILE"
+  exit 1
+}
+
+# Trap errors and call the error handler
+trap 'error_handler' ERR
+
+# Log command execution to the log file for debugging
+log_and_run() {
+  "$@" 2>&1 | tee -a "$LOG_FILE"
+}
+
+# Start port-forwarding in the background
+kubectl port-forward svc/$SERVICE -n $NAMESPACE $LOCAL_PORT:$TARGET_PORT &
+PORT_FORWARD_PID=$!
+
+# Check if the port-forwarding is running
+if ps -p $PORT_FORWARD_PID > /dev/null; then
+    log_and_run echo "Port-forwarding established. Querying metrics..."
+
+    # Use curl to check metrics
+    log_and_run curl -f http://localhost:$LOCAL_PORT/metrics > metrics_output.txt
+
+    if [ $? -eq 0 ]; then
+       log_and_run  echo "Metrics fetched successfully. Metrics output:"
+        log_and_run cat metrics_output.txt
+        METRICS_WORKING=true
+    else
+        log_and_run echo "Failed to fetch metrics from http://localhost:$LOCAL_PORT/metrics"
+        METRICS_WORKING=false
+    fi
+
+    # Kill port-forwarding process
+    log_and_run kill $PORT_FORWARD_PID
+else
+    log_and_run echo "Port-forwarding failed to establish."
+    METRICS_WORKING=false
+fi
+
+# Exit with appropriate status for CI
+if [ "$METRICS_WORKING" = true ]; then
+    exit 0
+else
+    exit 1
+fi
+

.github/workflows/ci-e2e-tests.yml

@@ -104,6 +104,10 @@ jobs:
       run: |
         .github/scripts/e2e_tests_brownfield_use_case.sh
 
+    - name: E2E tests for brownfield use case using kustomize
+      run: |
+        .github/scripts/e2e_tests_metrics_service.sh
+
     - name: "Delay completion"
       if: ${{ github.event_name == 'workflow_dispatch' && inputs.debug_enabled }}
       uses: scality/actions/action-delay-job-completion@1.11.0