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effdd3f3b6
Commit 9f3665fb removed the vacuum_cleanup_index_scale_factor storage parameter. However, that creates dump/reload hazards when moving across major versions. Add back the vacuum_cleanup_index_scale_factor parameter (though not the GUC of the same name) purely to avoid problems when using tools like pg_upgrade. The parameter remains disabled and undocumented. No backpatch to Postgres 13, since vacuum_cleanup_index_scale_factor was only disabled by REL_13_STABLE's version of master branch commit 9f3665fb in the first place -- the parameter already looks like this on REL_13_STABLE. Discussion: https://postgr.es/m/YEm/a3Ko3nKnBuVq@paquier.xyz