Status variables for implicit commits and rollbacks

It would be great to have status variables for:

• autocommits
• transactions implicitly committed (because of an ALTER TABLE, for example)
• transactions automatically rolled back (error occurred, timeout, KILL...)

This would be useful in at least two ways:

• Counting TPS would be easy
• A high number of automatic rollbacks could indicate that there are problems in applications
• Same goes for implicit commits