wal_consistency_checking currently runs in CI effectively nowhere (only opt-in via PG_TEST_EXTRA on src/test/recovery/t/027_stream_regress.pl; only BRIN has always-on coverage). Enable PG_TEST_EXTRA=wal_consistency_checking for at least one Linux CI task in this repo's CI configuration so primary/standby replay divergences are caught continuously. Verify locally that 027_stream_regress passes with it enabled and document the runtime cost.
wal_consistency_checking currently runs in CI effectively nowhere (only opt-in via PG_TEST_EXTRA on src/test/recovery/t/027_stream_regress.pl; only BRIN has always-on coverage). Enable PG_TEST_EXTRA=wal_consistency_checking for at least one Linux CI task in this repo's CI configuration so primary/standby replay divergences are caught continuously. Verify locally that 027_stream_regress passes with it enabled and document the runtime cost.