replication slots: Postgres Release Notes - All Versions - bucardo.org. PostgreSQL: Documentation: 12: 19.6. Replication. Monitoring Postgres Replication - pgDash.
max_replication_slots: Min: 0, Max: 262143, Default: 10, Context: postmaster, Needs restart: true • Sets the maximum number of simultaneously defined replication
slots.
How to setup PostgreSQL Streaming Replication with Replication
Slots on Debian 10.