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Cloudflare makes hash_in_range() available on all plans

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The Rules function can select a portion of requests, with examples for random sampling and staged rollouts.

Cloudflare has made `hash_in_range()` available for HTTP products on every plan, according to its Rules changelog. The function hashes fields into a bounded integer, enabling rules to target a portion of requests. For random sampling, Cloudflare demonstrates using `cf.random_seed` with a range from 0 to 100 and matching results below 10, selecting approximately one request in ten. For Cloudflare for SaaS, users can set a per-hostname custom metadata key, `rollout_pct`, to control the share selected during a rollout. Cloudflare says to set that value as an integer from 0 to 100; the example uses `coalesce()` to supply 0 when metadata is missing, so the rule matches no requests.

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  1. Rules changelog

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