pgstat: test stats interactions with physical replication.
Tests that standbys:
- drop stats for objects when the those records are replayed
- persist stats across graceful restarts
- discard stats after immediate / crash restarts
Author: Melanie Plageman <melanieplageman@gmail.com>
Author: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/
20220303021600.hs34ghqcw6zcokdh@alap3.anarazel.de