As a user, I can use a "Flackiness Score" gadget

A new JIRA gadget "Flackiness Score" should provide a chart with the calculated flackiness score for the given test runs.

Aim: This chart will provide the means to analyze what tests are most flacky/undeterministic and thus need to be reviewed.

xx: testkey
yy: calculated flackiness score
order: *preferably *sorted in descending order of flackiness score

Filters:

• saved filter (for finding Test Executions)
• testplan or project+version
• test run's assignee, status, priority, component
• test environment
• test type

The flackiness score should be calculated as follows.

Flackiness Score = nr_of_changes / total_possible_changes
nr_of_changes = amount of times a test changed from a final state to another final state through time
total_possible_changes = total_test_runs_in_final_status - 1

Chart Title: by default "Execution Burndown" but may be customized

Note: it's expected flackiness to be evaluated against tests executed against the same code version.