I was looking for recipe providing libfm4. I did not find the recipe, but the maintainer is still listed: RECIPE_MAINTAINER_pn-libpfm4 = "Matthew McClintock <msm@freescale.com>" I suspect this is not the only case.
Maxin pruned the list in oe-core 8076e0bcad1e7676a3747c489b0a8c76821bbcdc.