# =============================================================================
# VMRule - Regras de Alerta (Referência)
# =============================================================================
#
# Este arquivo é apenas referência. A versão aplicada está em:
#   gitops/apps/victoria-metrics/templates/alerts.yaml
#
# Para aplicar manualmente (sem GitOps):
#   kubectl apply -f alerts/vmalert-rules.yaml -n monitoring
#
# =============================================================================

apiVersion: operator.victoriametrics.com/v1beta1
kind: VMRule
metadata:
  name: custom-alerts
  namespace: monitoring
spec:
  groups:
    # -------------------------------------------------------------------------
    # Alertas de Storage/PVC
    # -------------------------------------------------------------------------
    - name: storage-alerts
      rules:
        - alert: PVCAlmostFull
          expr: |
            (kubelet_volume_stats_used_bytes / kubelet_volume_stats_capacity_bytes) > 0.8
            and
            (kubelet_volume_stats_used_bytes / kubelet_volume_stats_capacity_bytes) < 0.95
          for: 5m
          labels:
            severity: warning
          annotations:
            summary: "PVC {{ $labels.persistentvolumeclaim }} está acima de 80%"
            description: "PVC {{ $labels.persistentvolumeclaim }} no namespace {{ $labels.namespace }} está usando {{ $value | humanizePercentage }} do espaço."

        - alert: PVCFull
          expr: |
            (kubelet_volume_stats_used_bytes / kubelet_volume_stats_capacity_bytes) > 0.95
          for: 1m
          labels:
            severity: critical
          annotations:
            summary: "PVC {{ $labels.persistentvolumeclaim }} está CHEIO (>95%)"
            description: "AÇÃO URGENTE NECESSÁRIA!"

    # -------------------------------------------------------------------------
    # Alertas de Pods
    # -------------------------------------------------------------------------
    - name: pod-alerts
      rules:
        - alert: PodCrashLooping
          expr: |
            sum(increase(kube_pod_container_status_restarts_total[1h])) by (pod, namespace) > 5
          for: 5m
          labels:
            severity: warning
          annotations:
            summary: "Pod {{ $labels.pod }} está em CrashLoop"

        - alert: PodNotReady
          expr: |
            kube_pod_status_ready{condition="false"} == 1
          for: 5m
          labels:
            severity: warning
          annotations:
            summary: "Pod {{ $labels.pod }} não está Ready"

    # -------------------------------------------------------------------------
    # Alertas de Nodes
    # -------------------------------------------------------------------------
    - name: node-alerts
      rules:
        - alert: NodeHighCPU
          expr: |
            100 - (avg by(instance) (rate(node_cpu_seconds_total{mode="idle"}[5m])) * 100) > 90
          for: 5m
          labels:
            severity: warning
          annotations:
            summary: "Node {{ $labels.instance }} com CPU alta"

        - alert: NodeLowMemory
          expr: |
            (node_memory_MemAvailable_bytes / node_memory_MemTotal_bytes) < 0.1
          for: 5m
          labels:
            severity: warning
          annotations:
            summary: "Node {{ $labels.instance }} com pouca memória"

        - alert: NodeDiskFull
          expr: |
            (node_filesystem_avail_bytes{fstype!~"tmpfs|overlay"} / node_filesystem_size_bytes{fstype!~"tmpfs|overlay"}) < 0.15
          for: 5m
          labels:
            severity: critical
          annotations:
            summary: "Disco do Node {{ $labels.instance }} quase cheio"