Redis (rate limits, caps)

Counters for rate limits and usage caps across gateway replicas. Unset, counters live in memory (fine for one replica); a Redis outage falls back with a warning rather than failing boot.

AGENT_REDIS_URL=redis://localhost:6379

Docs: https://redis.io/docs/

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Source: docs/integrations/redis.md — edit it there; the site mirrors the repository.