Caching by reflex adds a cache because a dashboard looks bad. Caching with intent starts by naming the expensive computation, the acceptable staleness, and the invalidation path before a single key is written.
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A 94% hit rate can still hide a brutal p99. This video shows why hot-key stampedes and synchronized TTLs wreck tail latency — and the three levers that fix it.
Every cache is a bet on the future correctness of data. This article explains how to start from invalidation rules, split data by volatility, and instrument cache age to avoid serving stale lies.