Hi All I set up Postgres 11 stream replication env.Use keepalived to control VIP and a script to check Postgres status. Usually. I could check the stream replication status by this view "pg_stat_replcation" on primary server. Check this view "pg_stat_wal_receiver" on standby server.
Sometime the primary server abnormal or the network interrupt by unexpected issue. Both of them no record "pg_stat_replcation", "pg_stat_wal_receiver" on that time. I want to know the stream replication gap between primary and standby before standby promote. If the primary and standby have long replay_lag. I don't want to standby server promote. Is there any view or function which store the latest stream replication gap(replay_lag) between primary and standby ? Or it there any workaround to know this stream replication gap(replay_lag) infomation ? Thanks for your help. Jack.Xu