ssube/prometheus-sql-adapter

-- get labels size
SELECT
  nspname || '.' || relname AS "relation",
  pg_size_pretty(pg_total_relation_size(C.oid)) AS "total_size"
FROM pg_class C
LEFT JOIN pg_namespace N
ON (N.oid = C.relnamespace)
WHERE
  nspname NOT IN ('pg_catalog', 'information_schema') AND
  C.relkind <> 'i' AND
  nspname !~ '^pg_toast' AND
  relname LIKE 'metric%'
ORDER BY pg_total_relation_size(C.oid) DESC;