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	federation
federation enables federated queries to be resolved via the kubernetes plugin.
Enabling federation without also having kubernetes is a noop.
Syntax
federation [ZONES...] {
    NAME DOMAIN
- Each NAME and DOMAIN defines federation membership. One entry for each. A duplicate NAME will silently overwrite any previous value.
Examples
Here we handle all service requests in the prod and stage federations.
. {
    kubernetes cluster.local
    federation cluster.local {
        prod prod.feddomain.com
        staging staging.feddomain.com
    }
}
Or slightly shorter:
cluster.local {
    kubernetes
    federation {
        prod prod.feddomain.com
        staging staging.feddomain.com
    }
}