Error monitoring and logging in No-Code - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

What is the output of this log filtering command?

You have a log file named app.log with multiple error and info messages. Which command will output only lines containing the word ERROR?

No-Code

cat app.log | grep ERROR

A Outputs lines containing the word ERROR but only from the last 10 lines

B Outputs all lines except those containing ERROR

C Outputs lines containing the word error (case insensitive)

D Outputs all lines containing the word ERROR

💡 Hint

Think about how grep filters lines by matching text.

The command grep ERROR filters and shows only lines that contain the exact word ERROR.

🧠 Conceptual

intermediate

Which logging level indicates the most severe problems?

In error monitoring, logs have levels like DEBUG, INFO, WARNING, ERROR, and CRITICAL. Which level means the most serious issue?

A CRITICAL

B DEBUG

C ERROR

D WARNING

💡 Hint

Think about which level means the system might fail or crash.

CRITICAL level means a very serious error that needs immediate attention.

❓ Troubleshoot

advanced

Why does this log monitoring tool miss some errors?

A log monitoring tool is set to watch a log file but misses some error messages. The log file is rotated daily. What is the most likely cause?

A The tool only reads logs once at startup

B The tool is not configured to follow the new rotated log file

C The log file has no errors during rotation

D The errors are logged at INFO level

💡 Hint

Think about what happens to log files when they rotate.

When logs rotate, the original file is renamed and a new file is created. The tool must be configured to follow the new file to catch new logs.

🔀 Workflow

advanced

What is the correct order to set up error monitoring?

Put these steps in the right order to set up error monitoring for an application:
1. Configure alert rules
2. Collect logs from the application
3. Analyze logs for errors
4. Deploy monitoring tool

A 4,2,3,1

B 2,3,4,1

C 4,1,2,3

D 2,4,1,3

💡 Hint

Think about what must be ready before you can analyze logs or set alerts.

First deploy the monitoring tool, then collect logs, analyze them, and finally configure alerts based on analysis.

✅ Best Practice

expert

Which practice improves error log readability and troubleshooting?

Which of these practices best helps teams quickly understand and fix errors from logs?

A Store logs only locally on the application server

B Use unstructured plain text logs with minimal details

C Log errors with timestamps, severity, and unique error codes in a structured format

D Log only error messages without context to reduce log size

💡 Hint

Think about what information helps identify and fix problems faster.

Structured logs with timestamps, severity levels, and unique error codes make it easier to search, filter, and understand errors.