Autovacuum missing tables

Autovacuum is sometimes skipping certain tables. The tables in question
are pretty busy. A vacuum analyze works fine when run manually. The
tables in question were successfully autovacuumed this morning, but that
is the first time since the 23rd where it worked. I'm not finding any
logging info regarding the autovacuum. I'm not sure if autovacuum is
seeing table locks or what, but is there a way to run a more aggressive
autovacuum?

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