CLUSTER COUNTKEYSINSLOT slot
Returns the number of keys in the specified Redis Cluster hash slot. The command only queries the local data set, so contacting a node that is not serving the specified hash slot will always result in a count of zero being returned.
> CLUSTER COUNTKEYSINSLOT 7000 (integer) 50341
Integer reply: The number of keys in the specified hash slot, or an error if the hash slot is invalid.
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https://redis.io/commands/cluster-countkeysinslot