UPDATE:
in qts there is another command “system-docker ps” I got now 2 lines:
2954xxxxxxx5 mattermost/app:3xxxxxxf "/entrypoint.sh matt…" 7 weeks ago Up 7 weeks 8065/tcp mattermost_ap p_1
fd63xxxxxxxf mattermost/db:3xxxxxxxf "/entrypoint.sh post…" 7 weeks ago Up 7 weeks 5432/tcp mattermost_db
xxxx covered some other real numbers/letter.
Maybe is it a light at the end of the tunnel ?