Identify the missing word(s) in the following sentence within the context of Microsoft Azure. Azure Database for PostgreSQL uses a similar model to MySQL in its standard deployment model; however, Azure PostgreSQL also offers a scale-out hyperscale solution called [?]. [?] provides both scale-out and additional high availability for a server group. If enabled, a standby replica is configured for every node of a server group, which would also increase cost since it would double the number of servers in the group. In the event, the original node has a problem such as becoming unresponsive or failing completely, the standby takes its place. The data is kept in sync via PostgreSQL synchronous streaming replication.