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> accumulate locally

Is that an option in AppEngine? The memcache docs seem to indicate the free tier has undocumented eviction policies.

You have to implement that with your own code but it isn't much more than a dict/map and a timestamp for last update.

Same-ish problem, though. You wouldn't know for sure the instance will run again...your dict/map data can be dropped. I don't see any sort of instance timeout callback where you could guard against that.

I think it's negligible. The only metrics you lose are on rare scaledowns and they are averaged out anyways. GCP likes to keep instances idle for a long time.

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