Tell us about what you're trying to solve. What challenges are you facing?
Postgres Plans with High Availability have standby only for leader database and the followers don't have any hidden standby. In case of failures followers can take upto 15 minutes to come back online which can be critical for production applications. Having standbys for followers or some kind of load balancing among followers would be helpful in such situations.
https://heroku.support/1168081
https://devcenter.heroku.com/articles/heroku-postgres-ha
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Postgres
Tell us about what you're trying to solve. What challenges are you facing?