config_version

root@master:~ # tail -n1 /etc/puppetlabs/code/environments/production/environment.conf
config_version = config_version.sh

root@master:~ # cat /etc/puppetlabs/code/environments/production/config_version.sh
#!/bin/sh
/bin/echo "Puppet run starting at `date`: ╰( ⁰ ਊ ⁰ )━☆ﾟ.*･｡"

root@master:~ # puppet agent -t
Info: Using configured environment 'production'
Info: Retrieving pluginfacts
Info: Retrieving plugin
Info: Loading facts
Info: Caching catalog for master.puppetlabs.vm
Info: Applying configuration version 'Puppet run starting at Wed Nov 23 14:50:11 PST 2016: ╰( ⁰ ਊ ⁰ )━☆ﾟ.*･｡'