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RUN 27139 CP docs upgrade - keeping redis pubsub #1455

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RUN 27139 CP docs upgrade - keeping redis pubsub #1455

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10 changes: 10 additions & 0 deletions docs/admin/runai-setup/self-hosted/k8s/upgrade.md
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Expand Up @@ -96,6 +96,16 @@ The Run:ai control-plane installation has been rewritten and is no longer using
--set postgresql.primary.persistence.existingClaim=pvc-postgresql \
--set thanos.receive.persistence.existingClaim=pvc-thanos-receive
```
### Upgrade from version < 2.21 to >= 2.21
In version 2.21 we swapped our redis pubsub system with nats.
In order to prevent loss of pubsub events, we recommend keeping the redis alive for another version, thus, allowing all of the remaning messages to be handled.
During the upgrade, please add the following:

``` bash
--set redisQueue.enabled=true \
--set global.pubsub.additionalSubscriber.enabled=true
```


## Upgrade Cluster

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