:mod:`trac.ticket.roadmap` -- The Roadmap and Milestone modules
The component responsible for the Roadmap feature in Trac is the RoadmapModule. It provides an overview of the milestones and the progress in each of these milestones.
The component responsible for interacting with each milestone is the MilestoneModule. A milestone also provides an overview of the progress in terms of tickets processed.
The grouping of tickets in each progress bar is governed by the use of another component implementing the ITicketGroupStatsProvider interface. By default, this is the DefaultTicketGroupStatsProvider (for both the RoadmapModule and the MilestoneModule), which provides a configurable way to specify how tickets are grouped.