I have a primary Postgres server with 2 standbys setup using streaming replication. Both the stand by servers are using the replication slots. Today, when I checked the status of replication slots on primary, they are showing active= ‘f’. The data is replicating with no issues but when the slots are inactive I know that the wal files generated after the restart_lsn will not be deleted and retains the transactions, which is very critical. I am not sure exactly why the slots are inactive and if there is a way to activate them back?