This page https://datahubproject.io/docs/what/mxe/#metadata-audit-event-mae can be reached via linksc present in https://datahubproject.io/docs/architecture/metadata-serving/ but is not present on the sidebar when looking at docs page. Is this intentional?

Yep it’s intentional - the docs without sidebars haven’t fully been updated, and we don’t want the docs to be misleading