As presented at the November french meetup of saltstack users, we've published code to generate some statistics about a salstack infrastructure. We're using it, for the moment, to identify which parts of our infrastructure need attention. One of the tools we're using to monitor this distance is munin.
You can grab the code at bitbucket salt-highstate-stats, fork it, post issues, discuss it on the mailing lists.
Hope you find it useful.