feat(thanos): prometheus rules added for sidecar

!4

templates/PrometheusRule-thanos.yaml

@@ -0,0 +1,55 @@
+{{ if .Values.nfc_monitoring.thanos.sidecar.enabled }}
+---
+apiVersion: monitoring.coreos.com/v1
+kind: PrometheusRule
+metadata:
+  labels:
+    app.kubernetes.io/component: metrics
+    app.kubernetes.io/name: thanos
+    app.kubernetes.io/part-of: {{  $.Chart.Name }}
+    app.kubernetes.io/managed-by: {{  $.Release.Service }}
+    app.kubernetes.io/version: {{  $.Chart.Version }}
+    prometheus: k8s
+    role: alert-rules
+  name: thanos-rules
+  namespace: {{  .Values.nfc_monitoring.prometheus.namespace }}
+spec:
+  groups:
+    - name: thanos-sidecar
+      rules:
+      - alert: ThanosSidecarBucketOperationsFailed
+        annotations:
+          description: Thanos Sidecar {{ `{{` }}$labels.instance}} bucket operations are failing
+          runbook_url: https://github.com/thanos-io/thanos/tree/main/mixin/runbook.md#alert-name-thanossidecarbucketoperationsfailed
+          summary: Thanos Sidecar bucket operations are failing
+        expr: |
+          sum by (job, instance) (rate(thanos_objstore_bucket_operation_failures_total{job=~".*thanos-sidecar.*"}[5m])) > 0
+        for: 5m
+        labels:
+          severity: critical
+      - alert: ThanosSidecarNoConnectionToStartedPrometheus
+        annotations:
+          description: Thanos Sidecar {{ `{{` }}$labels.instance}} is unhealthy.
+          runbook_url: https://github.com/thanos-io/thanos/tree/main/mixin/runbook.md#alert-name-thanossidecarnoconnectiontostartedprometheus
+          summary: Thanos Sidecar cannot access Prometheus, even though Prometheus seems
+            healthy and has reloaded WAL.
+        expr: |
+          thanos_sidecar_prometheus_up{job=~".*thanos-sidecar.*"} == 0
+          AND on (namespace, pod)
+          prometheus_tsdb_data_replay_duration_seconds != 0
+        for: 5m
+        labels:
+          severity: critical
+      - alert: ThanosSidecarIsDown
+        annotations:
+          description: ThanosSidecar has disappeared. Prometheus target for the component
+            cannot be discovered.
+          runbook_url: https://github.com/thanos-io/thanos/tree/main/mixin/runbook.md#alert-name-thanossidecarisdown
+          summary: Thanos component has disappeared.
+        expr: |
+          absent(up{job=~".*thanos-sidecar.*"} == 1)
+        for: 5m
+        labels:
+          severity: critical
+
+{{ end }}