1. Unusually period of issues 2. None issue time 3. Unusually long time spent in a specific milestone. 4. Time spent in a milestone is unusually short. 5. large number of issues in a specific milestone. 6. small number of issues in a specific milestone. 7. large number of issues posted by a single user. 8. small number of issues posted by a single user. 9. issues involved users. 10. commits number in a specific time gap time? 11. commits by a single user. 12. number of pull request/branches. 13. number of time each label is used. 14. duration of issues.
