I don’t think that this is documented but you could ask Mendix support. I think that more people are interested in it (I am).
Hi Nikel
running "select name, setting from pg_settings where name = 'autovacuum'"' with com.mendix.core.DataStorage()'s connection obj on the Mendix cloud boxes reveals
name,setting
autovacuum,on
last_autovacuum field is filled
relname,last_vacuum,last_autovacuum,last_analyze,last_autoanalyze
foo$bar,null,null,2019-07-08 09:19:20.383822+00,null
What is your experience?