As you can see, build history produces image information,
including dependency graphs, so you can see why something
was pulled into the image.
If you are just interested in this information and not
interested in collecting history or any package information,
you can enable writing only image information without
any history by adding the following
to your conf/local.conf
file found in the
Build Directory:
INHERIT += "buildhistory" BUILDHISTORY_COMMIT = "0" BUILDHISTORY_FEATURES = "image"