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info keyspace in Redis gives output like:
db0:keys=XXX,expires=YYY
What does expires mean in this? I'm not able to find any documentation for it? Does it mean the number of keys for which the expiry is set?
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When a key has an expire set, Redis will make sure to remove the key when the specified amount of time elapsed. The key time to live can be updated or entirely removed using the EXPIRE and PERSIST command (or other strictly related commands).
Redis keyspace notifications allow you to subscribe to PubSub channels. Through the channel, clients receive published events when a Redis command or data alteration occurs. These notifications are useful when an application must respond to changes that occur to the value stored in a particular key or keys.
As noted in the accepted answer, expiration in Redis is only performed at key-level - nested elements cannot be expired. To "expire" items, call ZREMRANGEBYSCORE from -inf and the current epoch minus 24 hours.
Yes, it shows the number of keys that will expire at some point in the future.
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