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In #24650 we switched to using ephemeral state for CNI plugins, so that when a host reboots and we lose all the allocations we don't end up trying to use IPs we created in network namespaces we just destroyed. Unfortunately upgrade testing missed that in a non-reboot scenario, the existing CNI state was being used by plugins like the ipam plugin to hand out the "next available" IP address. So with no state carried over, we might allocate new addresses that conflict with existing allocations. (This can be avoided by draining the node first.) As a compatibility shim, copy the old CNI state directory to the new CNI state directory during agent startup, if the new CNI state directory doesn't already exist. Ref: https://github.com/hashicorp/nomad/pull/24650