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dist/rules/kubernetes/kubestate-exporter.yml

@@ -148,6 +148,15 @@ groups:
         summary: Kubernetes HPA scale capability (instance {{ $labels.instance }})
         description: "The maximum number of desired Pods has been hit\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
 
+    - alert: KubernetesHpaUnderutilized
+      expr: 'max(quantile_over_time(0.5, kube_horizontalpodautoscaler_status_desired_replicas[1d]) == kube_horizontalpodautoscaler_spec_min_replicas) by (horizontalpodautoscaler) > 3'
+      for: 5m
+      labels:
+        severity: info
+      annotations:
+        summary: Kubernetes HPA underutilized (instance {{ $labels.instance }})
+        description: "HPA is constantly at minimum replicas for 50% of the time\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
+
     - alert: KubernetesPodNotHealthy
       expr: 'sum by (namespace, pod) (kube_pod_status_phase{phase=~"Pending|Unknown|Failed"}) > 0'
       for: 15m