Why Code Quality Metrics Are Like A Canary In A Coal Mine

by | Sep 17, 2025

B O N C O D E   B L O G

When I speak to customers about code quality and productivity, there’s often a moment of quiet discomfort. It’s the moment where someone asks: “But what if these metrics are used to measure my team’s performance?”

I get it. I’ve led technical teams, run projects, and sat in more steering committee meetings than I care to count. There’s always a danger in turning insight into a scoreboard. But here’s how I see it, and how I like to explain it to clients: the metrics we gather at BonCode aren’t targets; they’re ‘the canary in the coal mine’. Let me explain.

By Jan Willem Klerkx, CEO, BonCode

Metrics as an early warning system

Back in the day, coal miners would carry a canary into the mines. The bird wasn’t there to sing them a tune, it was there to keep them alive. If the canary stopped chirping, it was a sign of dangerous, invisible gases building up. An early warning. A sign to get out, fast.

That’s how I think of the data we deliver to our clients. Churn, quality scores, maintainability, architectural drift, these aren’t final judgments, they’re signals. They’re indicators that help answer one very important question: “Is this still a healthy environment for software development?”

We’ve worked with teams where the codebase is pristine and technically beautiful. But there was hardly any churn, i.e. no new features were being built. Devs were busy polishing because no real requirements were making it through. That’s not a quality problem. That’s an organizational issue.

Without visibility into these patterns, it’s easy to mistake stillness for stability. But software teams need motion. Healthy tension between delivery and maintainability. That’s what balance looks like.

Don’t over-manage the metrics

One of the biggest mistakes I see is when organizations turn quality metrics into KPIs, mandates that developers are asked to hit. And if that happens, they’ve missed the point.

We provide data to surface issues, not to assign blame. The goal is to understand what’s happening beneath the surface, before the project starts to suffer. Like the canary in the coal mine, they’re an alarm system to make you change course.

If the churn drops unexpectedly, if the maintainability shoots up too high without corresponding delivery, those are prompts for a conversation. But these things don’t automatically mean your devs are slacking or that you’ve failed as a software manager. 

Healthy projects are balanced projects

In large, distributed teams, particularly across multinational organizations or highly complex domains, things get blocked. Priorities get stuck. Meetings multiply. And development teams wait and polish, and polish and wait.

Similarly, when teams move too fast, without proper attention to structure or maintainability, the system can collapse under its own weight six months down the line. It’s not speed or quality. It’s about balance.

At BonCode, we help organizations find that balance using facts, not opinions. We combine code-level insights with organizational context to give software leaders what they’ve often been missing: visibility. In complex environments, that kind of visibility is your early warning system.

Code metrics are early warnings, not performance goals. Discover how BonCode’s insights can help you prevent stalled projects from becoming delivery failures. Learn more

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