feat(zfs-exporter): create some alerts

cluster/apps/monitoring/zfs-exporter/alerts.yaml

@@ -0,0 +1,49 @@
+apiVersion: monitoring.coreos.com/v1
+kind: PrometheusRule
+metadata:
+  name: zfs-exporter-rules
+  labels:
+    release: kube-prometheus-stack
+spec:
+  groups:
+  - name: zfsexporter.rules
+    rules:
+    - alert: DriveErrorsCriticalAlert
+      expr: zfs_read_errors{device_type="disk"} + zfs_write_errors{device_type="disk"} + zfs_checksum_errors{device_type="disk"} > 1000
+      annotations:
+        summary: A drive encountered some errors (drive {{ $labels.device_name }})
+        description: "A drive encountered some errors! drive: {{ $labels.device_name }} in vdev {{ $labels.vdev }} in pool {{ $labels.pool }} \n error count: {{ $value }}"
+      labels:
+        severity: critical
+
+    - alert: DriveAnyErrorsAlert
+      expr: zfs_read_errors{device_type="disk"} + zfs_write_errors{device_type="disk"} + zfs_checksum_errors{device_type="disk"} > 0
+      annotations:
+        summary: A drive encountered some errors (drive {{ $labels.device_name }})
+        description: "A drive encountered some errors! drive: {{ $labels.device_name }} in vdev {{ $labels.vdev }} in pool {{ $labels.pool }} \n error count: {{ $value }}"
+      labels:
+        severity: warning
+    
+    - alert: DriveReadErrorsAlert
+      expr: zfs_read_errors{device_type="disk"} > 0
+      annotations:
+        summary: A drive encountered a checksum error (drive {{ $labels.device_name }})
+        description: "A drive encountered a checksum error! drive: {{ $labels.device_name }} in vdev {{ $labels.vdev }} in pool {{ $labels.pool }} \n error count: {{ $value }}"
+      labels:
+        severity: warning
+    
+    - alert: DriveWriteErrorsAlert
+      expr: zfs_write_errors{device_type="disk"} > 0
+      annotations:
+        summary: A drive encountered a checksum error (drive {{ $labels.device_name }})
+        description: "A drive encountered a checksum error! drive: {{ $labels.device_name }} in vdev {{ $labels.vdev }} in pool {{ $labels.pool }} \n error count: {{ $value }}"
+      labels:
+        severity: warning
+    
+    - alert: DriveChecksumErrorsAlert
+      expr: zfs_checksum_errors{device_type="disk"} > 0
+      annotations:
+        summary: A drive encountered a checksum error (drive {{ $labels.device_name }})
+        description: "A drive encountered a checksum error! drive: {{ $labels.device_name }} in vdev {{ $labels.vdev }} in pool {{ $labels.pool }} \n error count: {{ $value }}"
+      labels:
+        severity: warning