Why does postgresql have so many replication slots open?

As mentioned earlier, each subscription receives changes from a replication slot on the remote side Additional table

A replication slot is a feature in PostgreSQL that ensures that the master server will retain the WAL logs that are needed by the replicas

postgresql create replication slot Replication slots are recreated when a maintenance update is applied or a failover occurs , but they are not recovered after major

postgresql replication slot A replication slot is a feature in PostgreSQL that ensures that the master server will retain the WAL logs that are needed by the replicas