Zalando open source evangelist here. Some of my colleagues are on this thread, taking your questions. Meanwhile, wanted to plug a few other Postgres/K8s projects we're working on:
-- external-dns: a Kubernetes Incubator collaboration. Configure external DNS servers (AWS Route53, Google CloudDNS and others) for Kubernetes Ingresses and Services. (https://github.com/kubernetes-incubator/external-dns)
The Tech team at Zalando also has an open-source projects dashboard: https://zalando.github.io/. It's searchable by language, with some popular projects for PostgreSQL, APIs/Swagger spec, and Python.