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//opt/redis-8/src/commands/pubsub-numsub.json

 {
    "NUMSUB": {
        "summary": "Returns a count of subscribers to channels.",
        "complexity": "O(N) for the NUMSUB subcommand, where N is the number of requested channels",
        "group": "pubsub",
        "since": "2.8.0",
        "arity": -2,
        "container": "PUBSUB",
        "function": "pubsubCommand",
        "command_flags": [
            "PUBSUB",
            "LOADING",
            "STALE"
        ],
        "arguments": [
            {
                "name": "channel",
                "type": "string",
                "optional": true,
                "multiple": true
            }
        ],
        "reply_schema": {
            "description": "the number of subscribers per channel, each even element (including 0th) is channel name, each odd element is the number of subscribers",
            "type": "array"
        }
    }
}