How can I find the cause of pg_catalog.pg_attribute constantly being vacuumed? autovacuum seems to constantly run against pg_catalog.pg_attribute for the past week+. This seems pretty odd since we aren't doing constant table changes.

How can I understand why it's doing this and how to stop it? I'm on AWS Aurora and PG10.
Try to set log_statement=ddl to double check DDL statements. Maybe application code is creating temporary tables.