The metrics added in SERVER-76001 allow information to be gathered about the state of the PeriodicThreadToAbortExpiredTransactions, however if any expired transactions are aborted by the thread they would increment transactions.totalAborted - which cannot be differentiated from a transaction being aborted by calling abortTransaction.

This ticket proposes adding a new counter to metrics.abortExpiredTransactions that increments with each transaction the thread aborts directly based on expiration criteria being met.