Milestones

A milestone groups issues toward a target. Manage them at /:owner/:repo/milestones.

Creating a milestone

A title, an optional description, and an optional due date.

Progress

Progress is the ratio of closed issues to total issues in the milestone. It is a measured ratio, not an estimate, so it moves only when an issue actually closes.

Closing a milestone

Closing does not close the issues inside it. Open issues in a closed milestone stay open and stay visible — hiding them would make the milestone look finished when it is not.