Your Logs Are Lying to You (And What to Do About It)

The Hidden Price Tag of ‘Just One More Log’

Photo by Hitesh Choudhary on Unsplash

When your logs say everything… and nothing.

This is what happens when we use logging as a substitute for design.

Almost every developer has done it:

for (Order order : orders) {
    log.info("Processing order {}", order.getId());
    process(order);
}

It feels harmless when you have ten test orders on your laptop.
Push the same code to production - where there are two million orders an hour and suddenly:

• Pods get evicted because log files fill the disk.
• Your observability bill shoots past your coffee budget.
• Real errors disappear under a waterfall of “Processing order…”.

Logging isn’t the villain. Using it as duct-tape for deeper design problems is.
Below are four everyday logging mistakes (I’ve made every one of them), the pain they cause, and simple ways to turn the noise into real insight.

1. Hot-Loop Logging

for (User u : userList) {
    log.debug("User found: {}", u.getEmail());
    sendWelcomeMail(u);
}