Count HTTP 5xx Errors

Every dashboard number starts as raw events. The app's access log is at /var/log/app/access.log — count the HTTP 500 responses and record the number your dashboard would show.

Validator

⏱ 0:00

IDLE — checks run live as you type commands; submit when done

01Requirements

live checks

Directory ~/report exists○
File ~/report/5xx.txt exists and contains the 500 count○

02Walkthrough

1 of 5 revealed

01
Look at the access log
The common log format ends each line with the status code: "GET /api/items HTTP/1.1" 200 512. Status 500 means the server failed.
cat /var/log/app/access.log
4 locked · each failed submit reveals one

03Stuck?

0 of 3 revealed

Take a hint without losing the lab — each one points at the thing to look at, not at the answer.

04AI Tutor

guides, never solves

Tell me what you're stuck on — I'll nudge, not solve. Which requirement are you looking at?

04Notebook

saved locally in this browser

learner@lab — ubuntu:24.04

Session is disposable

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Kubernetes

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Extract Errors for the Incident Report

Observability