chore(ci): collect K8s diagnostics on E2E test failure

Add a step that runs on failure to capture pod logs, events,
configs, and node resource usage from all vector-* namespaces.
This avoids deep manual investigation when K8s E2E tests fail.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: pront

.github/workflows/k8s_e2e.yml

@@ -209,6 +209,48 @@ jobs:
           max_attempts: 3
           command: make test-e2e-kubernetes
 
+      - name: Collect K8s diagnostics on failure
+        if: failure()
+        run: |
+          echo "=== Namespaces ==="
+          kubectl get namespaces 2>&1 || true
+
+          for ns in $(kubectl get namespaces -o jsonpath='{.items[*].metadata.name}' | tr ' ' '\n' | grep -E '^vector-'); do
+            echo ""
+            echo "=========================================="
+            echo "=== Namespace: $ns ==="
+            echo "=========================================="
+
+            echo "--- Pods ---"
+            kubectl get pods -n "$ns" -o wide 2>&1 || true
+
+            echo "--- Pod descriptions ---"
+            kubectl describe pods -n "$ns" 2>&1 || true
+
+            echo "--- Container logs ---"
+            for pod in $(kubectl get pods -n "$ns" -o jsonpath='{.items[*].metadata.name}' 2>/dev/null); do
+              echo "--- Logs: $pod ---"
+              kubectl logs -n "$ns" "$pod" --tail=100 2>&1 || true
+              echo "--- Previous logs: $pod ---"
+              kubectl logs -n "$ns" "$pod" --previous --tail=50 2>&1 || true
+            done
+
+            echo "--- Events ---"
+            kubectl get events -n "$ns" --sort-by=.lastTimestamp 2>&1 || true
+
+            echo "--- ConfigMaps ---"
+            kubectl get configmaps -n "$ns" -o yaml 2>&1 || true
+          done
+
+          echo ""
+          echo "=== Node resources ==="
+          kubectl top nodes 2>&1 || true
+          kubectl describe nodes 2>&1 | grep -A20 "Allocated resources" || true
+
+          echo ""
+          echo "=== Minikube logs (last 100 lines) ==="
+          minikube logs --length=100 2>&1 || true
+
   final-result:
     name: K8s E2E Suite
     runs-on: ubuntu-24.04