I think what you're describing is really a showcase of a pub/sub system, and you're probably using Redis for a feature which is not in its core concern. Things

I think what you're describing is really a showcase of a pub/sub system, and you're probably using Redis for a feature which is not in its core concern. Things like RabbitMQ do this very well. You can use HA mode with RabbitMQ and not have a SPOF. Alternatively you can use Kafka (for really big traffic) or Kestrel for the same thing - they're less sophisticated than RabbitMQ but I see that as an advantage since they're simpler.