Some rpm files were missing.
Most likely, you want to create these signed copies.

Missing files:
/mnt/koji/packages/linstor-client/1.18.0/1/data/signed/3fd3ac9e/noarch/linstor-client-1.18.0-1.noarch.rpm
/mnt/koji/packages/python-linstor/1.18.0/1/data/signed/3fd3ac9e/noarch/python-linstor-1.18.0-1.noarch.rpm