Currently CG builds list the host they were built from in the 'Built by' section of build info. Koji should be able to accept an optional 'owner' build metadata key from a content generator build to replace the 'Built by' field with the user that built it. There should also be an optional 'submitter' field in the extra metadata to keep track of the host that built the content.
Partially related issue: #215 Mechanism for content generators to link to build task
Commit ef043e2c fixes this issue
Metadata Update from @tkopecek: - Issue set to the milestone: 1.12
This issue has been migrated to Fedora Forge: https://forge.fedoraproject.org/koji/koji/issues/299
Please continue any further discussion there.