Postgresql version of SQL Server Availability Groups?

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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