Redis Pub/Sub and Streams for messaging. Covers publish/subscribe,
streams with consumer groups, and real-time patterns. Use for
lightweight messaging and real-time features.
USE WHEN: user mentions "redis pub/sub", "redis streams", "real-time messaging", "lightweight messaging", "pattern subscriptions", asks about "fast messaging", "simple pub/sub", "event streams with redis"
DO NOT USE FOR: guaranteed delivery - use `kafka`, `rabbitmq`, or `pulsar`; complex routing - use `rabbitmq`; high durability needs - use `kafka`; enterprise features - use `activemq`; cloud-native - use cloud providers