Postgresql version of SQL Server Availability Groups?

[Ron <ronljohnsonjr@xxxxxxxxx>]

    Currently my customer has some very large stand-alone PostgreSQL 9.6
    (will migrate next year to v13) databases, and they want to add HA.
    
    Specifically, they want a "cluster name" which points to a Primary
    database server's IP address, and and which automatically
    (presumably through through a heartbeat and quorum voting system)
    points to a Secondary database server's IP address if the Primary
    server goes down.  Both servers are in the same data center. 
    (Replication would be handled by a standard PostgreSQL method.)
    
    This is not load balancing, but a purely HA solution.
    
    I looked at HAProxy, but it seems to be focused on load balancing,
    while the Patroni documentation does not seem to mention a cluster
    name.
    
    Am I missing something?

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