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docs: Add docs for REDIS_KEY_PREFIX, REDIS_CLUSTER env vars (#4334)

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# Description 

Add documentation for using the REDIS_KEY_PREFIX, REDIS_CLUSTER env
vars.
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langchain-infra
2025-04-23 11:17:03 -04:00
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docs/docs/cloud/reference/env_var.md
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@@ -97,3 +97,21 @@ Database Connectivity:
Custom Redis instances are only available for [Self-Hosted Data Plane](../../concepts/langgraph_self_hosted_data_plane.md) and [Self-Hosted Control Plane](../../concepts/langgraph_self_hosted_control_plane.md) deployments.
Specify `REDIS_URI_CUSTOM` to use a custom Redis instance. The value of `REDIS_URI_CUSTOM` must be a valid [Redis connection URI](https://redis-py.readthedocs.io/en/stable/connections.html#redis.Redis.from_url).
## `REDIS_KEY_PREFIX`
!!! info "Available in API Server version 0.1.9+"
This environment variable is supported in API Server version 0.1.9 and above.
Specify a prefix for Redis keys. This allows multiple LangGraph Server instances to share the same Redis instance by using different key prefixes.
Defaults to `''`.
## `REDIS_CLUSTER`
!!! info "Only Allowed in Self-Hosted Deployments"
Redis Cluster mode is only available in Self-Hosted Deployment models, LangGraph Cloud SaaS will provision a redis instance for you by default.
Set `REDIS_CLUSTER` to `True` to enable Redis Cluster mode. When enabled, the system will connect to Redis using cluster mode. This is useful when connecting to a Redis Cluster deployment.
Defaults to `False`.