feat(cluster): expose declarative logical replication (Publication/Subscription) - #973
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…bscription) Adds `publications` and `subscriptions` values that render CNPG `Publication` and `Subscription` resources, plus a top-level `externalClusters` passthrough so a standalone cluster can reach the external publisher a subscription points at. Claude-Session: https://claude.ai/code/session_01PkQZAEh2YptQhk9ENfmKy8 Signed-off-by: Philippe Noël <philippemnoel@gmail.com>
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What
clusterchart viapublicationsandsubscriptions, rendered asPublication/Subscriptionresources.externalClusterspassthrough, injected into theClusterspec in any mode, so astandalonecluster can name the publisher a subscription points at.values.yaml,values.schema.jsonand the README, with publisher/subscriber examples.Why
The chart surfaces CNPG's one-shot
recovery.import, but not continuous logical replication — the mechanism behind a near-zero-downtime migration.cluster.externalClusterspreviously emitted entries only for therecovery/replicabootstraps, so astandalonesubscriber had no way to reference its publisher.Backwards compatibility
All three values default to
[]. The new templates then render nothing, andexternalClusters:is emitted under exactly the same conditions as before.Tests
helm lint charts/cluster, andhelm templateover everyexamples/andtest/values file diffed againstmain: byte-identicalClustermanifests.logical-replicationchainsaw test: a publisher cluster declaratively publishes a table, a subscriber consumes it through a user-definedexternalClustersentry, and the row is asserted to replicate.