Hello All,
We have a PostgreSQL 10.12 cluster of servers in two different data centers. Off lately, in the case of a large WAL generation, we are seeing replication delay between the master and the standby server. These delays have off lately been there for an unusually long time. I was wondering if we have any metric that can calculate the amount (size) of WAL transfer left between master and standby?
PS: We have ensured we have upgraded our firewalls for better speed transfer.
Any help on how to figure out the slowness in the WAL transfer would be much appreciated.