* `matching` - push all matching branches.
All branches having the same name in both ends are considered to be
matching. This is the default.
-* `tracking` - push the current branch to its upstream branch.
+* `upstream` - push the current branch to its upstream branch.
+* `tracking` - deprecated synonym for `upstream`.
* `current` - push the current branch to a branch of the same name.
rebase.stat::