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Lists the currently *active channels*.
An active channel is a Pub/Sub channel with one or more subscribers (excluding clients subscribed to patterns).
If no `pattern` is specified, all the channels are listed, otherwise if pattern is specified only channels matching the specified glob-style pattern are listed.
Cluster note: in a Redis Cluster clients can subscribe to every node, and can also publish to every other node. The cluster will make sure that published messages are forwarded as needed. That said, `PUBSUB`'s replies in a cluster only report information from the node's Pub/Sub context, rather than the entire cluster.
@return
@array-reply: a list of active channels, optionally matching the specified pattern.
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