📊 Bài 23: Monitoring với Prometheus

# Cài bằng Helm
helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
helm repo update

helm install prometheus prometheus-community/kube-prometheus-stack \
    --namespace monitoring --create-namespace

# Xem pods
kubectl get pods -n monitoring

# Prometheus UI
kubectl port-forward svc/prometheus-kube-prometheus-prometheus \
    9090:9090 -n monitoring

# Grafana (user: admin, pass: prom-operator)
kubectl port-forward svc/prometheus-grafana \
    3000:80 -n monitoring

# AlertManager
kubectl port-forward svc/prometheus-kube-prometheus-alertmanager \
    9093:9093 -n monitoring

# CPU usage của pods
sum(rate(container_cpu_usage_seconds_total[5m])) by (pod)

# Memory usage
container_memory_usage_bytes{namespace="default"}

# HTTP requests
sum(rate(http_requests_total[5m])) by (status_code)

apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  name: my-app-monitor
  labels:
    release: prometheus
spec:
  selector:
    matchLabels:
      app: my-app
  endpoints:
    - port: metrics
      path: /metrics
      interval: 30s