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An issue tracker is a system that records and manages bugs, tasks, feature requests, and other work items in a software project. Each issue has a title, priority, status, and assignee. Teams use issue trackers to prioritize work, communicate about problems, and track progress from discovery to resolution.
Issue lifecycle
A typical issue moves through: Open (reported, not yet assigned) → In Progress (being worked on) → Resolved (fix implemented, awaiting verification) → Closed (verified and done). Some trackers add steps like Blocked, Won't Fix, or Duplicate. Keeping issues in the right status lets the team see actual work in progress vs backlog at a glance.
Priority levels
Critical — system is down, data loss, security vulnerability. Requires immediate action. High — major feature broken, significant user impact. Fix within current sprint. Medium — functionality degraded but workaround exists. Schedule in next sprint. Low — minor cosmetic issues, nice-to-have improvements. Address when bandwidth allows.
Bug tracker vs issue tracker
A bug tracker records software defects — unexpected behaviors, crashes, or incorrect output. An issue tracker is broader — it handles bugs, feature requests, tasks, and support tickets. Most modern teams use issue trackers with a "Bug" type label rather than separate tools. GitHub Issues, Jira, Linear, and YouTrack are issue trackers. Historically, Bugzilla and Mantis were pure bug trackers.
Choosing an issue tracker depends on team size, integration needs, and workflow complexity.