Wasn't there a draft somewhere along the way on a global guidelines on
how to set the metrics?
I remeber seeing something like that. However i went further by
explicitly separating per-hop metrics into static (administrative)
and dynamic (injected from IGP) parts, with an explicit visibility
scope for the dynamic part.
If there's any interest i can dig the draft out and place it on my www
Ok, it is in http://www.pluris.com/avg/draft-bgpmetric.ps and .txt.