ERROR: relation "postgres_partitions" does not exist at character 454

I've upgraded gitlab(13.4.3->13.7.1) , I got following error.

2021-01-07 16:03:58.707 JST [1] LOG:  database system is ready to accept connections
2021-01-07 16:04:30.951 JST [1717] ERROR:  relation "postgres_partitions" does not exist at character 454
2021-01-07 16:04:30.951 JST [1717] STATEMENT:  SELECT a.attname, format_type(a.atttypid, a.atttypmod),
	       pg_get_expr(d.adbin, d.adrelid), a.attnotnull, a.atttypid, a.atttypmod,
	       c.collname, col_description(a.attrelid, a.attnum) AS comment
	  FROM pg_attribute a
	  LEFT JOIN pg_attrdef d ON a.attrelid = d.adrelid AND a.attnum = d.adnum
	  LEFT JOIN pg_type t ON a.atttypid = t.oid
	  LEFT JOIN pg_collation c ON a.attcollation = c.oid AND a.attcollation <> t.typcollation
	 WHERE a.attrelid = '"postgres_partitions"'::regclass
	   AND a.attnum > 0 AND NOT a.attisdropped
	 ORDER BY a.attnum

How do I fix?

Start by investigating the PostgreSQL error and the GitLab 13.4.3 to 13.7.1 upgrade context, using the logged query against postgres_partitions as the entry point. Done means identifying the migration or schema state responsible and documenting a verified remediation for affected Dockerized GitLab installations.