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obey the following 5 meanings of terminology _cluster_ in Patroni. 1. PostgreSQL cluster: a cluster of postgresql instances which have the same system identifier. 2. MPP cluster: a cluster of PostgreSQL clusters that one of them acts as Coodinator and others act as workers. 3. Coordinator cluster: a PostgreSQL cluster which act the role of 'coordinator' within a MPP cluster. 4. Worker cluster: a PostgreSQL cluster which act the role 'worker' within a MPP cluster. 5. Patroni cluster: all cluster managed by Patroni can be called Patroni cluster, but we usually use this term to refering a single PostgreSQL cluster or an MPP cluster.