grafana: make alerts better for fux

resources/chaosknoten/grafana/docker_compose/prometheus_alerts-fux.rules.yaml

@@ -2,22 +2,20 @@ groups:
   - name: Fux-Generic
     rules:
       - alert: HostJobFlaky
-        expr: group by(instance, job) (changes(up{org="fux"}[24h]) > 7)
+        expr: group by(host, job) (changes(up{org="fux"}[24h]) > 7)
         for: 0m
         labels:
           severity: info
-          org: fux
         annotations:
-          summary: Job {{ $labels.job }} flaky on (instance {{ $labels.instance }})
-          description: "The job {{ $labels.job }} on target: {{ $labels.instance }} has been flaky over the last 24 hours."
+          summary: Job {{ $labels.job }} flaky on (host {{ $labels.instance }})
+          description: "The job {{ $labels.job }} on target: {{ $labels.host }} has been flaky over the last 24 hours."
   - name: Fux-SNMP
     rules:
       - alert: SnmpTargetMissing
-        expr: up{job=~".*snmp.*", org="fux"} == 0
+        expr: up{job=~".*snmp|SNMP.*"} == 0
         for: 15m
         labels:
           severity: critical
-          org: fux
         annotations:
           summary: SNMP target missing (instance {{ $labels.instance }})
           description: "SNMP target: {{ $labels.instance }} has disappeared for more the 15 min."