All reports of menu-item-contains-unknown-tag for the archive. The extended description of this tag is:

The menu item has a line that has a tag in it that is not one of the standard tags (needs=, section=, title=, longtitle=, command=, etc). While other tags can be used for specialized purposes, this is rare and it's more likely the tag's name is misspelled.

Severity: minor, Certainty: certain

Check: menu-format, Type: binary

This tag has not been emitted in any package tested by Lintian.