Cyclomatic complexity
This metric has no screenshot. Open it in the interactive 3D view of a project below.
What it measures
Sum of the cyclomatic complexity (McCabe) of all functions of a file: the number of independent paths through the code, counted by Lizard for about 25 languages.
How to read it
Height is the complexity. Tall buildings contain much branching logic.
Why it matters
Each path needs a test. Complex files are harder to test and to change safely. Combined with change frequency it shows the hotspots that matter most.