I spent a long time preparing for this because for a managed postgres service there's a hiccup: https://wiki.postgresql.org/wiki/Locale_data_changes

> in glibc version 2.28, released 2018-08-01, a major update to the locale data has been included, which can potentially affect the data of many users

Migrating to rhel8 was being considered, but since locale changes are inevitable, it made an opportunity to have us pivot to ubuntu