Prometheus 指標收集

Vibe Prompt

「幫我寫 Prometheus 設定檔：監控 K8s 叢集的節點、Pod、Deployment，每 15 秒抓一次。」

prometheus.yml

global:
  scrape_interval: 15s
  evaluation_interval: 15s

scrape_configs:
  - job_name: 'kubernetes-apiservers'
    kubernetes_sd_configs:
      - role: endpoints
    scheme: https

  - job_name: 'kubernetes-nodes'
    kubernetes_sd_configs:
      - role: node
    relabel_configs:
      - action: labelmap
        regex: __meta_kubernetes_node_label_(.+)

  - job_name: 'kubernetes-pods'
    kubernetes_sd_configs:
      - role: pod
    relabel_configs:
      - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scrape]
        action: keep
        regex: true

  - job_name: 'node-exporter'
    static_configs:
      - targets: ['node-exporter:9100']

關鍵指標

# CPU 使用率
100 - (avg by(instance) (rate(node_cpu_seconds_total{mode="idle"}[5m])) * 100)

# 記憶體使用率
(1 - node_memory_MemAvailable_bytes / node_memory_MemTotal_bytes) * 100

# Pod 重啟次數
rate(kube_pod_container_status_restarts_total[5m])

# 磁碟空間
(1 - node_filesystem_avail_bytes / node_filesystem_size_bytes) * 100