Synopsis: Count of commits that do not come from the project owner. Gain additional insight by gathering metadata on these commits such as committer identity, committer business unit, or or commit timestamp.
Unit of Measurement: Ordinal number
Interpretation: Higher contribution count is generally better. Higher diversity of contribution across people, business units or time frame is generally better
Measuring
Look in your source control system to see who is committing to the project. Check to see who are the project owners. Count all commits from those who are not project owners.