SUBSCRIBESubscribe to the given channels.
| Syntax | SUBSCRIBE channel [channel ...] |
| Group | pubsub |
| Arity | -2 |
| Since | 1.0.0 |
| Flags | readonly, pubsub |
| Complexity | O(c) channels; never fans out to other shards |
| Redis compatibility | differs: kevy has no RESP2 subscriber mode — after SUBSCRIBE the connection may still issue any command, where Redis restricts it to the pubsub verbs plus PING / QUIT / RESET |