TTL jitter

RU: TTL jitter (джиттер TTL)

A caching technique that adds a random offset to a cache entry's TTL so that entries populated at the same time expire at different times. Without jitter, a fleet of servers that cached the same key simultaneously will all miss together, sending a synchronized wave of requests to the origin (cache stampede). Spreading expirations over a window proportional to the base TTL distributes that load smoothly.