Hi! Thank you.
That's why you use monitoring. Never use replication slots without monitoring replication (or at least the disk space on the primary).
How to implement this automatically, without human interaction required ? "superuser_reserved_connections" setting exists. How about implementing "data_reserved_space" setting ? How to create procedure in server or maybe cron scipt which stops replication if disk becomes nearly full ? How to force to stop replication slot in master if it is in use ? Andrus.