Exact package name to watch, or space delimited list of packages to match
Note, that multi-package works only for old api, and may not work as expected.
the builds of all space split packages are obtained and fitlered, and the logic is applied to the merged list.
So for eg "A B" if package A have 10 very old builds, and package B ten very new builds, only builds of B will be processed.
If you suddenly build A, then it willbe of course pulled.