Add more replicas to the PostgreSQL cluster
There are some parallel lines of work in order to prevent the pgbouncer CPU saturation. In the meanwhile, we need to decrease the probability of new spikes to appear.
Until we have a more definitive solution, I propose to add two more replicas to the current PostgreSQL cluster. This will help spread the load a bit more among the replicas; and should not create significant additional load on the current master node.
This measure should be reverted once a final solution is implemented for the pgbouncer saturation.