Paths/DevOps Engineer/Observability / Log Triage
Extract Errors for the Incident Report
During an incident you hand the on-call engineer a filtered log, not a gigabyte file. Extract every ERROR line from yesterday's app log into a dedicated file.
Validator
⏱ 0:00
IDLE — checks run live as you type commands; submit when done
01Requirements
live checks- File ~/report/errors.log exists○
- It contains only ERROR lines from the 2026-09-27 application log○
02Walkthrough
1 of 5 revealed- 01
Create the report directory
The report will live in ~/report — every lab starts from a fresh shell, so make it first.
mkdir ~/report - 4 locked · each failed submit reveals one
03Stuck?
0 of 3 revealedTake a hint without losing the lab — each one points at the thing to look at, not at the answer.
04AI Tutor
guides, never solvesTell me what you're stuck on — I'll nudge, not solve. Which requirement are you looking at?
04Notebook
saved locally in this browserlearner@lab — ubuntu:24.04
Session is disposable
↑/↓ recalls commands · Ctrl+Enter submits · type help for the command list