* Added check for pg_checkpoint role presence
This commit provides the needed infrastructure in `repmgr` so if the `repmgr` database
user is a member of the `pg_checkpoint` role, and inherits its privileges, there is no
need for such a user to be a superuser.
Co-authored-by: Martín Marqués <martin.marques@enterprisedb.com>
Anyone still using PostgreSQL 9.4 should re-examine their life choices
at this point, but as it is not yet de-supported by repmgr, consolidate
the references to it whenever pg_rewind is mentioned to a single
section.
