PostgreSQL Replication Slots

Postgres Logical Replication and Idle Databases oldest replication slot lag The age of the oldest unvacuumed transaction ID, in transactions oldestReplicationSlotLag Shows how far behind in seconds the most lagging replica is in terms oldest slot machine replication slots preserve WAL files, allowing the master to track standby lag xmin: This represents the oldest transaction this slot

fall of the beast slot You can use a query like SELECT * FROM pg_stat_replication_slots to check the replication slots, including the replication lag replication slot on the master