[openstreetmap/openstreetmap-website] Unauthenticated session expiry (PR #5270)

[mmd]

I can't validate the assumption in production and don't know what test cases to add. Or in other words, I was stuck with the current state and decided to close it, as there's no way to make any progress on it.

Assuming a slab is full and new entries need to be added. There are two possible options: entries that expire sooner (rather than never) get evicted first, or some random entry will be evicted. Both options are bad, since they might remove valid user sessions.

To me, this question is not super important. I would rather let the LRU crawler clean up short lived anonymous sessions as soon as possible, and never get to a state where eviction is unavoidable. Ideally, this change would keep the items in the cache at a very low number all the time, and never get to a point of 80%+ memory usage.

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