A report listing every account with its debit or credit balance, and the totals at the bottom. If total debits equal total credits, the ledger is internally consistent; if not, something is broken and month-end can't proceed.
In Bizdivers: Accounting → Trial Balance shows a clear Balanced or Out of Balance indicator for any as-of date and basis, and a balanced trial balance is a blocking item on the close checklist. See The bookkeeper's toolkit.