Maintainability Index explained
summary
Defines the maintainability index as a code-only KPI computed from cyclomatic complexity (decision count) and Halstead volume (size/operators), not from infra or business logic. Reports generate a per-file bubble chart where circle size maps to complexity and color to MI; aim for small red bubbles to disappear and prioritize the big red ones. Notes that MI needs context and per-class granularity to be actionable rather than a standalone truth.
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