Comprehension debt
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What it measures
Share of the lines of a file (by blame) that no active person wrote or changed last: lines from AI assisted commits and lines of authors without a commit in the last 180 days.
How to read it
Height is lines of code. Red means hardly anyone in the team has written this code, white means active people know it first hand.
low
highest value in project
Why it matters
Like knowledge loss, but AI counts as an author nobody can ask. Tall red buildings are code to review, test and explain before the next larger change.