Currently it is possible to do settings for build history cleaning.
We need the cleaning otherwise it consumes to much diskspace (in 100+ builds is
consumes 3Gb+ per project).
So I changed the settings to discard builds after 25 builds. But then I loose
also the trend analysis over the builds which are removed.

It would be very nice to be able to remove all long log files (and disk
consuming files) from old builds, but keep analysis logic of these. It will be
great the see trend analysis on build duration longer then only 25 builds, also
the number of tests etc. Logfiles are not needed to keep as long as that trend
data (in our case)