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docs(cache): clarify TTL directive (#7941)

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Ville Vesilehto
2026-03-17 20:55:11 +02:00
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commit ece6a68b04
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plugin/cache/README.md vendored
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@@ -26,6 +26,10 @@ cache [TTL] [ZONES...]
* **ZONES** zones it should cache for. If empty, the zones from the configuration block are used.
Each element in the cache is cached according to its TTL (with **TTL** as the max).
Note that **TTL** only caps the cache duration and does not extend it. A record with a 30s TTL
will still be cached for 30s even with `cache 600`. The minimum cache duration defaults to 5
seconds and can be adjusted per cache type using **MINTTL** in the `success` or `denial` directives.
A cache is divided into 256 shards, each holding up to 39 items by default - for a total size
of 256 * 39 = 9984 items.