feat: adicionar aula-16 (Flagger), remover Jaeger da aula-14 e integrar tracing Istio na aula-15

- aula-16: nova aula de canary deployment automatizado com Flagger
- aula-14: removido Jaeger (tracing movido para aula-15), corrigido
  nome do serviço Victoria Metrics, adicionado rate limiting no Kiali
- aula-15: adicionado receiver Zipkin no OTel Collector para receber
  traces do Istio, corrigida porta do Tempo (3100→3200), integração
  automática com Istio quando detectado
- aula-03: corrigido MAX_REQUESTS de 10 para 3 (valor padrão)
- CLAUDE.md: adicionada aula-16 na documentação

aula-15/otel-collector-values.yaml

@@ -37,7 +37,10 @@ ports:
   jaeger-grpc:
     enabled: false
   zipkin:
-    enabled: false
+    enabled: true
+    containerPort: 9411
+    servicePort: 9411
+    protocol: TCP
 
 config:
   receivers:
@@ -47,6 +50,8 @@ config:
           endpoint: "0.0.0.0:4317"
         http:
           endpoint: "0.0.0.0:4318"
+    zipkin:
+      endpoint: "0.0.0.0:9411"
 
   connectors:
     spanmetrics:
@@ -79,7 +84,7 @@ config:
   service:
     pipelines:
       traces:
-        receivers: [otlp]
+        receivers: [otlp, zipkin]
         processors: [memory_limiter, batch]
         exporters: [otlp/tempo, spanmetrics]
       metrics/spanmetrics:

aula-15/setup.sh

@@ -209,7 +209,7 @@ data:
     datasources:
       - name: Tempo
         type: tempo
-        url: http://tempo.monitoring:3100
+        url: http://tempo.monitoring:3200
         access: proxy
         isDefault: false
         jsonData:
@@ -413,6 +413,63 @@ log_success "Ingress demo-app criado"
 log_info "Aguardando demo-app ficar pronta..."
 kubectl wait --for=condition=available deployment/demo-app -n demo --timeout=180s 2>/dev/null || true
 
+# =============================================================================
+# CONFIGURAR ISTIO TRACING (se Istio estiver instalado)
+# =============================================================================
+
+if kubectl get deployment istiod -n istio-system &> /dev/null; then
+    echo ""
+    log_info "=== Istio detectado — configurando tracing via OTel Collector ==="
+
+    OTEL_ZIPKIN_URL="otel-collector-opentelemetry-collector.monitoring"
+
+    # Configurar istiod para enviar traces ao OTel Collector via Zipkin
+    log_info "Configurando istiod para enviar traces ao OTel Collector..."
+    helm upgrade istiod istio/istiod -n istio-system \
+        --set "meshConfig.defaultConfig.tracing.zipkin.address=${OTEL_ZIPKIN_URL}:9411" \
+        --set 'meshConfig.defaultConfig.tracing.sampling=100' \
+        --set 'meshConfig.enablePrometheusMerge=true' \
+        --set 'meshConfig.extensionProviders[0].name=zipkin' \
+        --set "meshConfig.extensionProviders[0].zipkin.service=${OTEL_ZIPKIN_URL}.svc.cluster.local" \
+        --set 'meshConfig.extensionProviders[0].zipkin.port=9411' \
+        --reuse-values \
+        --wait --timeout=5m 2>/dev/null || log_warn "Falha ao configurar istiod (helm upgrade)"
+    log_success "istiod configurado"
+
+    # Criar Telemetry API resource
+    log_info "Criando Telemetry resource..."
+    kubectl apply -f - <<'TELEMETRY_EOF'
+apiVersion: telemetry.istio.io/v1
+kind: Telemetry
+metadata:
+  name: mesh-default
+  namespace: istio-system
+spec:
+  tracing:
+    - providers:
+        - name: zipkin
+      randomSamplingPercentage: 100
+TELEMETRY_EOF
+    log_success "Telemetry resource criado"
+
+    # Atualizar Kiali para apontar tracing ao Grafana/Tempo
+    log_info "Configurando Kiali para usar Tempo via Grafana..."
+    VICTORIA_METRICS_URL="http://vmsingle-monitoring-victoria-metrics-k8s-stack.monitoring:8429"
+    GRAFANA_HOST_INTERNAL="${GRAFANA_HOST:-grafana.${DOMAIN}}"
+    kubectl patch configmap kiali -n istio-system --type merge -p "{
+        \"data\": {
+            \"config.yaml\": \"auth:\\n  strategy: anonymous\\nlogin_token:\\n  signing_key: kiali-signing-key-1234\\nserver:\\n  web_root: /kiali\\nexternal_services:\\n  prometheus:\\n    url: ${VICTORIA_METRICS_URL}\\n  tracing:\\n    enabled: true\\n    provider: tempo\\n    internal_url: http://tempo.monitoring:3200\\n    use_grpc: true\\n  grafana:\\n    enabled: false\\n\"
+        }
+    }" 2>/dev/null || true
+    kubectl rollout restart deployment/kiali -n istio-system 2>/dev/null || true
+    log_success "Kiali configurado com Tempo"
+
+    log_info "Reinicie os pods com sidecar para ativar tracing:"
+    log_info "  kubectl rollout restart deployment -n <namespace>"
+else
+    log_info "Istio nao detectado — tracing apenas via OTel SDK (demo app)"
+fi
+
 # =============================================================================
 # APLICAR ALERTAS
 # =============================================================================