4.1 has only the "stable-4.1" channel.
In 4.2+ we have a "fast-4.2" channel and a "stable-4.2" channel (and similarly for later releases).
Create a PR for the Cincinnati graph.
Ask @architects-team and @over-the-air-updates in #forum-release on slack to merge the PR. Something like:

@architects-team @over-the-air-updates 4.y.z release is prepared for Cincinnati production channels.
Please merge when ready:
(fast) https://github.com/openshift/cincinnati-graph-data/pull/35
(stable) https://github.com/openshift/cincinnati-graph-data/pull/36

When the architects are done, you should see the release in the appropriate channel, for example:

$  curl -sH 'Accept: application/json' 'https://api.openshift.com/api/upgrades_info/v1/graph?arch=amd64&channel=stable-4.3' | jq '.nodes[]'