The unexpected things developer metrics can measure

Developer-experience metrics, typically used to evaluate tools like AI coding assistants or build systems, turn out to measure far more than software interventions. Data from multiple years shows measurable shifts in developer behavior tied to Daylight Saving Time (6% more active coding time, 8% faster PRs in Seattle), office space quality (13% engagement increase in well-designed offices, ~10% decline in poor ones), and weather events (18% drop in coding activity on Seattle snow days). The core insight is that good developer metrics measure outcomes—whether developers can do focused, meaningful, high-quality work—not the specific interventions. This makes them durable across changing technology trends, useful for explaining unexpected performance shifts, and valuable for making the case that workspace investment is a productivity investment, not just a facilities expense.