I guess this whole conversation deserves a proper SIG no ? There seem to be a lot of interest and several things to talk about: standards, policies, reports, software. Actually, just came across an ABI / API breakage site for popular open source projects :
http://upstream-tracker.org/

Some of the ones we use in our ecosystem are there:
http://upstream-tracker.org/versions/assimp.html
http://upstream-tracker.org/versions/opencv.html
http://upstream-tracker.org/versions/pcl.html
http://upstream-tracker.org/versions/yaml-cpp.html