The

--show config=[glob]

option to e.g. processCcd.py is very useful, but sometimes you find yourself wondering where that value came from. As discussed in http://community.lsst.org/t/how-do-i-get-the-history-of-a-configuration-object/162 you can get this information if you're willing to write some boiler-plate python but it'd be really nice to support via a --show
option. Something like

--show configHistory[=glob]

Kian-Tat Lim recommends starting from https://raw.githubusercontent.com/lsst/pex_config/ecacb7eafca021afb4c9b9e4852bcf9e4a9ede45/bin/configDoc.py