apiVersion: monitoring.coreos.com/v1
kind: PrometheusRule
metadata:
  creationTimestamp: null
  labels:
    prometheus: k8s
    role: alert-rules
  name: prometheus-example-rules
spec:
  groups:
  - name: ./example.rules
    rules:
    - alert: RAMUsage
      expr: (node_memory_MemAvailable_bytes / node_memory_MemTotal_bytes) < 0.95
      for: 5m
      labels:
        severity: info
      annotations:
        summary: "K8SServerTest {{ $labels.instance }} has a less than 95% RAM available"
        description: "K8SServerTest {{ $labels.instance }} has only {{ $value }}% of its total amount of RAM available!"