As of Jenkins 2.50, the build now button will have the tool tip Schedule a Scan for ___
To my mind the Lass Success, Last Failure and Last Duration columns logically refer to the action in the "Build" Now column.
As such, I believe adding new columns would only confuse users... we'd have a `Last Success` and a `Last Computation Success`, a `Last Failure` and a `Last Computation Failure`, a `Last Duration` and a `Last Computation Duration`... plus what would we do for e.g. Compact Columns?
I think if there is a use case for seeing the info for child builds, that should be a Last Child Build status column