aula-15: implementação completa APM (Tempo + OTel + demo app)

Componentes:
- tempo-values.yaml: Grafana Tempo monolithic, 256Mi, 10Gi PVC
- otel-collector-values.yaml: recebe OTLP, exporta traces→Tempo,
  gera span metrics (RED)→Victoria Metrics via spanmetrics connector
- demo-app/: Node.js com rotas /fast (1 query), /slow (N+1, 51 queries),
  /fixed (JOIN), auto-instrumentado com OpenTelemetry
- alerts/latency-alerts.yaml: VMRule com Doherty threshold (p95>400ms)
- setup.sh: instala Tempo, OTel Collector, configura Grafana datasource,
  deploy demo app via ConfigMap (sem Docker build necessário)
- cleanup.sh: remove apenas recursos da aula-15, preserva aula-12

Zero hardcoded hostnames. Tudo via .env e placeholders.

aula-15/cleanup.sh

@@ -0,0 +1,129 @@
+#!/bin/bash
+# =============================================================================
+# Aula 15 - Cleanup (Remove APM: Tempo + OTel + Demo App)
+# =============================================================================
+#
+# Remove:
+#   - Demo app namespace (demo)
+#   - Grafana Tempo (Helm release)
+#   - OpenTelemetry Collector (Helm release)
+#   - Grafana datasource ConfigMap (Tempo)
+#   - Alertas de latencia
+#   - Arquivo .env
+#
+# NAO remove:
+#   - Victoria Metrics / Grafana (pertencem a aula-12)
+#   - Namespace monitoring
+#
+# =============================================================================
+
+set -e
+
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+BLUE='\033[0;34m'
+CYAN='\033[0;36m'
+NC='\033[0m'
+
+log_info() { echo -e "${BLUE}[INFO]${NC} $1"; }
+log_success() { echo -e "${GREEN}[OK]${NC} $1"; }
+log_warn() { echo -e "${YELLOW}[WARN]${NC} $1"; }
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+echo ""
+echo -e "${CYAN}═══════════════════════════════════════════════════${NC}"
+echo -e "${CYAN}  Cleanup - Aula 15 (APM)${NC}"
+echo -e "${CYAN}═══════════════════════════════════════════════════${NC}"
+echo ""
+
+log_warn "Isso vai remover:"
+echo "  - Namespace demo (demo app + PostgreSQL + dados)"
+echo "  - Grafana Tempo (Helm release)"
+echo "  - OpenTelemetry Collector (Helm release)"
+echo "  - Datasource Tempo no Grafana"
+echo "  - Alertas de latencia"
+echo ""
+echo -e "${GREEN}NAO sera removido:${NC}"
+echo "  - Victoria Metrics (aula-12)"
+echo "  - Grafana (aula-12)"
+echo "  - Namespace monitoring"
+echo ""
+read -p "Continuar? (digite 'sim' para confirmar): " confirm
+
+if [ "$confirm" != "sim" ]; then
+    log_info "Operacao cancelada"
+    exit 0
+fi
+
+echo ""
+
+# -------------------------------------------------------------------------
+# 1. Remover namespace demo (demo app + PostgreSQL)
+# -------------------------------------------------------------------------
+log_info "Removendo namespace demo..."
+if kubectl get namespace demo &> /dev/null; then
+    kubectl delete namespace demo --timeout=60s 2>/dev/null || true
+    log_success "Namespace demo removido"
+else
+    log_info "Namespace demo nao encontrado"
+fi
+
+# -------------------------------------------------------------------------
+# 2. Remover Grafana Tempo
+# -------------------------------------------------------------------------
+log_info "Removendo Grafana Tempo..."
+if helm status tempo -n monitoring &> /dev/null; then
+    helm uninstall tempo -n monitoring --wait 2>/dev/null || true
+    log_success "Tempo removido"
+else
+    log_info "Tempo nao encontrado"
+fi
+
+# Remover PVC do Tempo
+kubectl delete pvc -n monitoring -l app.kubernetes.io/name=tempo --wait=false 2>/dev/null || true
+
+# -------------------------------------------------------------------------
+# 3. Remover OpenTelemetry Collector
+# -------------------------------------------------------------------------
+log_info "Removendo OpenTelemetry Collector..."
+if helm status otel-collector -n monitoring &> /dev/null; then
+    helm uninstall otel-collector -n monitoring --wait 2>/dev/null || true
+    log_success "OTel Collector removido"
+else
+    log_info "OTel Collector nao encontrado"
+fi
+
+# -------------------------------------------------------------------------
+# 4. Remover datasource ConfigMap do Tempo no Grafana
+# -------------------------------------------------------------------------
+log_info "Removendo datasource Tempo do Grafana..."
+kubectl delete configmap grafana-datasource-tempo -n monitoring 2>/dev/null || true
+log_success "Datasource removido"
+
+# Reiniciar Grafana para remover datasource
+log_info "Reiniciando Grafana..."
+kubectl rollout restart deployment -n monitoring -l app.kubernetes.io/name=grafana 2>/dev/null || true
+
+# -------------------------------------------------------------------------
+# 5. Remover alertas de latencia
+# -------------------------------------------------------------------------
+log_info "Removendo alertas de latencia..."
+kubectl delete -f "${SCRIPT_DIR}/alerts/latency-alerts.yaml" -n monitoring 2>/dev/null || true
+log_success "Alertas removidos"
+
+# -------------------------------------------------------------------------
+# 6. Remover .env
+# -------------------------------------------------------------------------
+if [[ -f "${SCRIPT_DIR}/.env" ]]; then
+    rm "${SCRIPT_DIR}/.env"
+    log_info ".env removido"
+fi
+
+echo ""
+log_success "Cleanup concluido!"
+echo ""
+echo "O namespace monitoring e Victoria Metrics + Grafana foram mantidos."
+echo "Para remover tudo, execute o cleanup da aula-12."
+echo ""