fix: remove obsolete Redis down alert rules for clarity

Signed-off-by: zhenyus <zhenyus@mathmast.com>

freeleaps/helm-pkg/3rd/redis-cluster/values.prod.yaml

@@ -1122,15 +1122,7 @@ metrics:
     ##      summary: Redis® instance {{ "{{ $instance }}" }} has evicted keys
     ##      description: Redis® instance {{ "{{ $instance }}" }} has evicted {{ "{{ $value }}" }} keys in the last 5 minutes.
     ##
-    rules:
-      - alert: RedisDown
-        expr: redis_up == 0{service="{{ template "common.names.fullname" . }}-metrics"} == 0
-        for: 0m
-        labels:
-          severity: critical
-        annotations:
-          summary: Redis down (instance {{ "{{ $instance }}" }})
-          description: Redis instance is down\n  VALUE = {{ "{{ $value }}" }}\n  LABELS = {{ "{{ $labels }}" }}
+    rules: []
   ## @param metrics.priorityClassName Metrics exporter pod priorityClassName
   ##
   priorityClassName: ""