For {T308}.

"Engineering Community Jan 2015 Quarterly Review" says:
  Success measures: Documentation portal
* Needs of WMF teams, Wikimedia contributors, and 3rd party developers gathered and documented.
* Plan agreed including goals, features, technology selections, and documentation workflows.
* Proposal for resourcing and progressive deployment agreed with the teams involved.
* Documentation task force including volunteer editors.
* Documentation backlog properly maintained.