docs(proxy): add a page listing what needs Redis

[devin-ai-integration]

Summary

New page at /docs/proxy/redis_requirements listing every feature we know stops working, or silently works per worker, when the proxy runs without Redis: rate limits and budgets counted per worker, usage and latency based routing, cooldowns, response and semantic caching, key/team cache invalidation, DB-stored config propagation, the Redis spend transaction buffer, the pod lock that elects a single runner for scheduled jobs, shared health checks, request prioritization, CLI SSO, MCP outbound OAuth tokens, and background response polling.

The page says up front that multi-pod without Redis is beta and the list is not exhaustive: it is the best known functionality, other features may also misbehave, and the GA approach for multi-pod is to run Redis. The setup instructions live in #864 and both the "Configure Redis" section and the note about REDIS_* env vars link there rather than duplicating them.

It exists because the Admin UI now shows a default-on banner when no Redis is configured (BerriAI/litellm#36495) and that banner links here. LITELLM_DISABLE_NO_REDIS_WARNING is documented in the env var table alongside the page, and the Redis section of Production Best Practices now points at it.

Link to Devin session: https://app.devin.ai/sessions/c91185109405404bbb87c4967a1346b0
Requested by: @mateo-berri

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Project	Deployment	Actions	Updated (UTC)
litellm	Ready	Preview	Aug 12, 2026 5:14am

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