How does key expiration work?

[oskari]

Not too familiar with redis or this cache handler. We have nextjs project that uses google Memorystore (Redis 7.0). I can see from the monitoring that keys are created in the database, but they seem to be really shortlived. Key expiration happens, according to the graphs, really fast. I think they only last for about 5 to 15 min range, not sure as the graphs are not that accurate.

What controls this? We've just impemented the redis-minimal example (redis-strings).