Client:LibPQWalReceiverReceive

LibPQWalReceiverReceive is a PostgreSQL wait event that occurs on a standby (replica) server when the WAL receiver process is waiting to receive WAL (Write-Ahead Log) data from the primary server over a replication connection using the libpq client library While LibPQWalReceiverReceive is typically normal and expected during replication—especially during low-write periods—persistent or long waits combined with growing replication lag may indicate:

Network issues between primary and standby,
A stalled or overloaded primary server,
Replication slot or authentication problems.