Hi,
there are at least two different compatibility matrices within the Graylog docs with different content, e.g MongoDB version usable with Graylog 4.3
https://go2docs.graylog.org/5-0/upgrading_graylog/upgrading_graylog_in_debian.htm
https://go2docs.graylog.org/5-0/planning_your_deployment/planning_your_upgrade_to_opensearch.htm
My suggestion:
Make one that is accurate and replace the other ones with a link.
Have a nice day!
Lars