apiVersion: v1
kind: ConfigMap
metadata:
  annotations:
    meta.helm.sh/release-name: observability-server
    meta.helm.sh/release-namespace: monitoring
  labels:
    app.kubernetes.io/component: server
    app.kubernetes.io/instance: observability-server
    app.kubernetes.io/managed-by: Helm
    app.kubernetes.io/name: prometheus
    app.kubernetes.io/part-of: prometheus
    app.kubernetes.io/version: v2.48.1
    helm.sh/chart: prometheus-25.8.2
  name: observability-server-prometheus-server
  namespace: monitoring
data:
  alerting_rules.yml: |
    groups:
      - name: host-monitoring
        rules:
          - alert: HighLoad
            expr: node_load1 > 2.0
            for: 5m
            labels:
              severity: warning
            annotations:
              summary: High load on {{ $labels.instance }}
              description: "Load is High (threshold: 2.0)"
          - alert: HighCpuUsage
            expr: 100 - (avg by (instance) (irate(node_cpu_seconds_total{mode="idle"}[5m])) * 100) > 90
            for: 5m
            labels:
              severity: critical
            annotations:
              summary: High CPU usage on {{ $labels.instance }}
              description: "CPU usage is > 80%"
          - alert: HighMemoryUsage
            expr: (node_memory_MemTotal_bytes - node_memory_MemFree_bytes - node_memory_Buffers_bytes - node_memory_Cached_bytes) / node_memory_MemTotal_bytes * 100 > 90
            for: 5m
            labels:
              severity: warning
            annotations:
              summary: High memory usage on {{ $labels.instance }}
              description: "Memory usage is High"
          - alert: HighDiskUsage
            expr: node_filesystem_avail_bytes{fstype="ext4"} / node_filesystem_size_bytes{fstype="ext4"} * 100 < 10
            for: 5m
            labels:
              severity: critical
            annotations:
              summary: High disk usage on {{ $labels.instance }}
              description: "Disk usage is High"