valinor/kubernetes/apps/monitoring/kube-prometheus-stack/app/prometheusrules/minio.yaml

---
# yaml-language-server: $schema=https://kubernetes-schemas.devbu.io/monitoring.coreos.com/prometheusrule_v1.json
apiVersion: monitoring.coreos.com/v1
kind: PrometheusRule
metadata:
  name: minio-rules
  namespace: monitoring
  labels:
    prometheus: k8s
    role: alert-rules
spec:
  groups:
    - name: minio-alerts
      rules:
        - alert: NodesOffline
          expr: avg_over_time(minio_cluster_nodes_offline_total{job="scrapeconfig/monitoring/minio-erebor"}[5m]) > 0
          for: 10m
          labels:
            severity: warn
          annotations:
            summary: "Node down in MinIO deployment"
            description: "Node(s) in cluster {{ $labels.instance }} offline for more than 5 minutes"

        - alert: DisksOffline
          expr: avg_over_time(minio_cluster_drive_offline_total{job="scrapeconfig/monitoring/minio-erebor"}[5m]) > 0
          for: 10m
          labels:
            severity: warn
          annotations:
            summary: "Disks down in MinIO deployment"
            description: "Disks(s) in cluster {{ $labels.instance }} offline for more than 5 minutes"