How to test
Edit config file /etc/abrt/abrt.conf, where you should find lines:
EnableOpenGPG = yes OpenGPGPublicKeys = /etc/pki/rpm-gpg/RPM-GPG-KEY-fedora, /etc/pki/rpm-gpg/RPM-GPG-KEY-rpmfusion-free-fedora
Set EnableOpenGPG to yes. Add path to GPG signature, delimited by colon.
# service abrt restart
Install package from the repository to which the new GPG key belongs to. Crash an application from this package - abrt should ignore it this time. Leave gpg check on and import the gpg key from the repo (if you haven't already). Add the gpg key into ABRT config, crash something from the package - and this time it should be reported.
<fixme: which repository to add as an example? how to install gpg key?>
ABRT should notice only crashes of applications from signed packages when EnableOpenGPG=yes, it should ignore packages from unsupported archives