The customer said:

We are interested in documenting our code with the use of PlantUML (http://plantuml.sourceforge.net/index.html). There is an existing PlantUML plugin for Confluence, but we would like something similar for Stash. Ideally, this would be some extension of the markdown support, so we could embed diagrams within .md pages. Alternatively, this could be a visualisation for .puml files. This should include full PlantUML support - some diagrams would require GraphViz to be available on the Stash server.