Content Model Documentation

Provides content entities for documenting site architecture.

Configure documentable entity types (doesn't automatically support everything).

Site note, principal, process additional document types. 

Provides architecture reports for fields and entities.

Has a ERD display using mermaid.js for exploring structure.

Can provide documentation for modules, similar to Module Usage Documentation.

Reports

• Node/Taxonomy count
  • Published/unpublished count per type.
  • Pie chart
• Field search
  • Lots of filter options to find fields.
  • Grouped by entity type.
• Content model fields
  • List of all content fields with sort and filter.
• Entity relationship diagram
  • Graph entity dependents.

See also:

https://www.drupal.org/project/builder_notes
Extra description field.

https://www.drupal.org/project/inline_documentation
Documentation per page? (outdated)