This feature is available in Enterprise and Ultimate editions.
Tracking settings are system-wide options that determine the level at which team progress is tracked (backlog level or task level), as well as whether actual Effort is tracked in addition to remaining To Do to indicate progress.
When Effort tracking is enabled within Lifecycle:
additional columns display in grids to capture Effort and roll up the accumulated amount of work Done.
Progress bars for sprints/iterations display the total amount Done vs. the remaining To Do estimate.
additional reports showing Effort are available
To make changes to effort tracking settings, your Admin Privileges role must be set to "System Administrator".