pushes to stable during freeze - process question

[Kamil Paral]

Quick question,

how do rel-eng guys know which updates are OK to push to stable during freeze and which are not? For example we have the final freeze now. Some packages like this:
https://admin.fedoraproject.org/updates/FEDORA-2011-14932
are needed to be pushed to stable repo, so they have an exception from the freeze. Blocker and NTH updates have also exception from the freeze. But other packages may be also requesting push to stable and not be eligible for an exception. How do the rel-eng guys know which packages to push and which not to?

Thanks.