feat(prometheus-stack): optional additional rules

charts/prometheus-stack/templates/additional-rules.yaml

@@ -0,0 +1,12 @@
+{{- if .Values.prometheusStack.alertmanager.additionalRules.enabled }}
+apiVersion: monitoring.coreos.com/v1
+kind: PrometheusRule
+metadata:
+  name: {{ printf "%s-%s" (include "kube-prometheus-stack.fullname" .) "prom-rules" | trunc 63 | trimSuffix "-" }}
+  namespace: {{ template "kube-prometheus-stack.namespace" . }}
+spec:
+  groups:
+    {{- range .Values.prometheusStack.alertmanager.additionalRules.groups }}
+      {{- toYaml . | nindent 4 }}
+    {{- end }}
+{{- end }}

charts/prometheus-stack/values.yaml

@@ -140,6 +140,20 @@ prometheusStack:
         requests:
           memory: "100Mi"
           cpu: "5m"
+    additionalRules:
+      enabled: false
+      groups: []
+#      - name: sensors
+#        rules:
+#          - alert: MissingData
+#            annotations:
+#              description: ""
+#              summary: ""
+#            expr: >
+#              sum() <= 0
+#            for: 5m
+#            labels:
+#              severity: warning
 
 # Kyverno Policy Exception
 policyException: