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Get the namespace list for that cluster.
/v1/clusters/{clusterId}/namespaces
curl -L \ --url '/v1/clusters/{clusterId}/namespaces'
[ { "creationTimestamp": "2022-12-02 06:21:35", "name": "cocktail-system", "status": "Active", "annotations": { "meta.helm.sh/release-name": "cocktail", "meta.helm.sh/release-namespace": "cocktail-system" }, "labels": { "istio-injection": "disabled", "kubernetes.io/metadata.name": "cocktail-system" } } ]