prune-packable: the number of loose objects that are also present in
the packs. These objects could be pruned using `git prune-packed`.
+
-garbage: the number of files in object database that are not valid
-loose objects nor valid packs
+garbage: the number of files in object database that are neither valid loose
+objects nor valid packs
+
size-garbage: disk space consumed by garbage files, in KiB (unless -H is
specified)