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[docs] Adds federation caveat to upgrade guide (#10847)

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Mike Nomitch
2021-07-09 06:42:17 -07:00
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website/content/docs/upgrade/index.mdx
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@@ -61,6 +61,10 @@ While it is possible to upgrade Nomad client nodes before servers, this guide
recommends upgrading servers first as many new client features will not work
until servers are upgraded.
In a [federated cluster](https://learn.hashicorp.com/tutorials/nomad/federation),
new features are not guaranteed to work until all agents in a region and the
server nodes in the authoritative region are upgraded.
Whether you are replacing Nomad in place on existing systems or bringing up new
servers you should make changes incrementally, verifying cluster health at each
step of the upgrade.