reduce loki retention to 8 days because it uses too much disk space (23G)

flux2/apps/monitoring/loki-release.yaml

@@ -66,10 +66,10 @@ spec:
         reject_old_samples: true
         reject_old_samples_max_age: 168h  # 7 days
       chunk_store_config:
-        max_look_back_period: 336h  # 14 days
+        max_look_back_period: 192h  # 8 days
       table_manager:
         retention_deletes_enabled: true
-        retention_period: 336h # 14 days
+        retention_period: 192h  # 8 days
   # Allow custom values either by configMap or by secret
   valuesFrom:
     - kind: ConfigMap