At 09:14 UTC on March 12, 2024, our CFO slacked the engineering channel a screenshot of an AWS bill for $51,237.82 — 4x our projected monthly cloud spend, all from unmonitored cloud sprawl across 14 AWS accounts we didn’t even know we had. 📡 Hacker News Top Stories Right Now A couple million lines of Haskell: Production engineering at Mercury (219 points) This Month in Ladybird – April 2026 (329 points) Unverified Evaluations in Dusk's PLONK (21 points) Dav2d (477 points) Six Years Perfecting Maps on WatchOS (291 points) Key Insights Unmonitored EC2 Spot instances in orphaned accounts accounted for 68% of the $50k overage, with 142 idle instances running for 11 days. AWS Config 2.1.4 and Cloud Custodian 0.7.12 caught 94% of sprawl within 24 hours of deployment in our staging environment. Implementing mandatory resource tagging reduced monthly cloud waste by $12k in Q2 2024, a 24% reduction from Q1 spend.…