CPU usage fix

ansible/roles/stack-monitor-stateful/templates/alertrules.nodes.yml

@@ -2,7 +2,7 @@ groups:
 - name: alertrules.nodes
   rules:
   - alert: high_cpu_usage_on_node
-    expr: sum by(nodename) (rate(process_cpu_seconds_total[5m]) * on(instance) group_left(nodename) node_uname_info * 100) > 95
+    expr: 100 - (avg by (instance) (irate(node_cpu_seconds_total{job="vm-node-exporter",mode="idle"}[5m])) * 100) > 90
     for: 1m
     annotations:
       description: '{% raw %}{{ $labels.nodename }}{% endraw %} ({% raw %}{{ $labels.host }}{% endraw %}) is using a LOT of CPU. CPU usage is {% raw %}{{ humanize $value}}{% endraw %}%.'

ansible/roles/stack-monitor/templates/alertrules.nodes.yml

@@ -2,7 +2,7 @@ groups:
 - name: alertrules.nodes
   rules:
   - alert: high_cpu_usage_on_node
-    expr: sum by(nodename) (rate(process_cpu_seconds_total[5m]) * on(instance) group_left(nodename) node_uname_info * 100) > 80
+    expr: 100 - (avg by (instance) (irate(node_cpu_seconds_total{job="vm-node-exporter",mode="idle"}[5m])) * 100) > 90
     for: 1m
     annotations:
       description: '{% raw %}{{ $labels.nodename }}{% endraw %} ({% raw %}{{ $labels.host }}{% endraw %}) is using a LOT of CPU. CPU usage is {% raw %}{{ humanize $value}}{% endraw %}%.'