Duplicated notifications

When using 
```
    queue:
      engine: "redis"
      redis:
        addr: "keydb.gorush.svc.cluster.local:6379"
        group: gorush
        consumer: gorush
        stream_name: gorush
```

And if you deploy in K8s with multiple container, each container will send the same notification. So basically you cannot scale because of this. Happens in latest version as well