Codensity Measures the Carbon Cost of Code

Field notes

Codensity attributes sampled production traces to endpoints, feature flags, or jobs, then applies energy and carbon coefficients covering CPU, memory, datacenter overhead, and grid intensity. The page reports under one percent request-time overhead and shows a 150 ms, 256 MB measurement resolving to 0.001792 kWh and 0.717 gCO2e. It also presents a deployment comparison in which query batching reduced weekly emissions by 46 kgCO2e, while budget alerts, customer-facing proof, and GitHub Actions enforcement remain marked as planned.