max_slot_wal_keep_size
Amazon Aurora PostgreSQL parameters
The max_slot_wal_keep_size parameter controls the quantity of WAL data that the RDS for PostgreSQL DB instance retains in the pg_wal directory to serve slots.
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Summary We are using max_slot_wal_keep_size from Postgresql 13 to prevent master from being killed by a lagging replication.
PostgreSQL 13: Don't let slots kill your primary
If max_slot_wal_keep_size is zero, which is the default value, then there’s no limit. I don’t recommend this, because it leads to failures when slots fill the disk.