If you use Atlassian's Clover and your job specifies a Clover directory (see Enabling the Clover add-on), you will be able to view the Clover coverage summary for the plan.
Lines of Code History chart showing changes in LOC over time
Note:
Charts are only generated when build results from at least a 2-day span are available. Where shorter time spans are available, the user will receive a warning stating "Insufficient data in range to draw the chart."
Where your plan contains multiple jobs with Clover, then Code Coverage and Lines of Code values are aggregated from all these jobs.
If your plan contains multiple jobs with Clover, the View latest Clover HTML report link will point to the default job only. In order to see other reports, you must go to the specific job summary, as described in Viewing the Clover code-coverage for a build.