Update docker.io/library/redis Docker tag to v8

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

@@ -12,7 +12,7 @@ groups:
           description: "The job {{ $labels.job }} on target: {{ $labels.instance }} has been flaky over the last 24 hours."
       - alert: ProbeFailed
         expr: group by(instance, job, ip) (probe_success{org="fux"} == 0)
-        for: 2m
+        for: 1m
         labels:
           severity: critical
           org: fux