Here's a short overview about the changes found in version 4.7.3:

* Type __ccollect_source: Add create destination parameter (Dominique Roux)
* Type __ssh_authorized_key: Add messaging (Thomas Eckert)
* New type: __letsencrypt_cert (Nico Schottelius, Kamila Součková)
* Core: Warn about invalid type in conf dir and continue instead of error (Darko Poljak)
* New type: __systemd_unit (Ľubomír Kučera)
* Type __letsencrypt_cert: Add support for debian stretch (Daniel Tschada)
* Type __line: Fix a case for absent when line contains single quotes (Darko Poljak)
* Type __config_file: Fix onchange command not being executed (Ľubomír Kučera)

For more information visit the cdist homepage.