5 DevOps Errors That Cost Developers the Most Time (And How to Fix Each)

5 DevOps Errors That Cost Developers the Most Time (And How to Fix Each) After diagnosing 1,800+ errors through ARIA, I've noticed patterns. The same five categories of errors cost developers the most debugging time — not because they're complex, but because developers look in the wrong place. Here's each one and the fastest path to a fix. 1. Disk Full (Silent App Killer) Time lost on average: 45-90 minutes Why it's hard: Apps crash without disk-related errors. You see a generic crash, a failed write, or a database refusing connections — not "disk full." The fix: df -h # Check disk usage du -sh /var/log/* | sort -rh | head -10 # Find what's using space sudo journalctl --vacuum-time=14d # Clear old system logs docker system prune -f # Clear unused Docker data find /tmp -mtime +7 -delete # Clear old temp files Prevention: Add a daily cron that alerts you when disk > 80%. 2. Environment Variable Missing in Production Time lost on average: 30-60 minutes Why it's hard: The error is usual