The rudder-agent package (and maybe others, but apparently none in standard repositories) is not upgraded on Debian 8 or Ubuntu 16.04 when an upgrade is available (with new package promises).
Apt output contains:
The jessie:jessie part is not expected by the apt_get module's regex and the line is ignored.
The following patch fixes the issue https://github.com/Normation/ncf/pull/566/files, but I do not know what jessie:jessie precisely means.
Is the current regex based on an apt reference document? Would you prefer a more precise regex than what is in the patch?