Hi,

I have a pair of PG servers, a master and a replica, all read-write queries are 
handled by the master, read-only ones are by the replica.  

>From time to time the replica itself is too busy, all read-only queries will 
>get  inconsistent results because of replication lag,  sometimes it can be 
>longer than 6 minutes.  I am thinking to add multiple replicas to off-load 
>read-only queries, can you please suggest a way to monitor and failover the 
>read-only query when the replication lag in a replica is more than 5 minutes?

regards

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