pg replication slots
How to Convert PostgreSQL Streaming Replication to Logical Replication
How to convert PostgreSQL's streaming replication to logical replication, a more flexible and selective method for replicating specific tables and filter data without starting anew.
How Patroni Addresses the Problem of the Logical Replication Slot ...
At a high level PostgreSQL supports two main types of replication - streaming/physical and logical ... You can read more about logical replication basics in Data To Go: Postgres Logical Replication.
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It is important for this reason to closely monitor replication slots to avoid too much disk consumption and other conditions that can happen such as catalog bloat if a replication slot stays unused for too long.