https://news.ycombinator.com/item?id=31882256
https://blog.palark.com/comparing-kubernetes-operators-for-postgresql/
https://github.com/cloudnative-pg/cloudnative-pg
https://github.com/jeremybusk/kubegres
https://github.com/percona/percona-postgresql-operator
https://github.com/zalando/postgres-operator