Alpha/Beta/GA blocker criteria?

[Allen Kistler]

Are there any differences about what constitutes a blocker for the 
different cycles (e.g., alpha vs. beta)?  One general basis would be 
different objectives for how much needs to work for the different 
pre-releases.  I looked around, but I didn't find anything documented.

Part of what started me looking is that anaconda appears to be unable to 
reuse existing ext filesystems when choosing custom layout on my test 
machines.  (I like to reuse /boot for multi-booting.)  How big a deal 
should that be for alpha, given that most early testing would involve 
blowing a drive away and starting from scratch?

BZ 513104 for those interested.