Why monitoring matters in Spring Boot - Challenge Your Understanding

Challenge - 5 Problems

🧠 Conceptual

intermediate

Why is monitoring critical in a Spring Boot application?

Choose the main reason why monitoring is essential for a Spring Boot application running in production.

A To increase the size of the application logs for auditing.

B To detect and alert on application errors and performance issues in real time.

C To replace the need for writing unit tests during development.

D To automatically update the application code without downtime.

💡 Hint

Think about what helps you know if your app is working well or if something is wrong.

Monitoring helps detect errors and performance problems quickly so you can fix them before users notice.

💻 Command Output

intermediate

Output of Spring Boot actuator health endpoint

What is the typical JSON output when you access the Spring Boot actuator health endpoint /actuator/health on a healthy application?

Spring Boot

curl http://localhost:8080/actuator/health

A

{
  "message": "Health check failed"
}

B

{
  "status": "DOWN"
}

C

{
  "error": "Service Unavailable"
}

D

{
  "status": "UP"
}

💡 Hint

Healthy means the app is running fine.

The health endpoint returns {"status": "UP"} when the application is healthy.

🔀 Workflow

advanced

Order the steps to enable monitoring in a Spring Boot app

Put these steps in the correct order to enable basic monitoring using Spring Boot Actuator.

A 1,3,2,4

B 2,1,3,4

C 1,2,3,4

D 3,1,2,4

💡 Hint

Think about what you need to add first before configuring and running the app.

You first add the dependency, then configure properties, start the app, and finally access endpoints.

❓ Troubleshoot

advanced

Why does the /actuator/health endpoint return 404?

You added Spring Boot Actuator to your project and started the app, but accessing /actuator/health returns a 404 error. What is the most likely cause?

A The actuator endpoints are not exposed in the application properties configuration.

B The application is not running on port 8080.

C The Spring Boot version does not support actuator endpoints.

D The health endpoint is disabled by default and cannot be enabled.

💡 Hint

Check if the endpoints are visible to external requests.

By default, actuator endpoints may not be exposed over HTTP. You must configure management.endpoints.web.exposure.include=health or all.

✅ Best Practice

expert

Best practice for monitoring sensitive data in Spring Boot

Which is the best practice to avoid exposing sensitive information in Spring Boot actuator monitoring endpoints?

A Restrict actuator endpoints access using security configurations and roles.

B Disable all actuator endpoints permanently.

C Expose all actuator endpoints publicly for easier debugging.

D Log sensitive data to application logs for audit purposes.

💡 Hint

Think about controlling who can see monitoring data.

Securing actuator endpoints with authentication and authorization prevents sensitive data leaks while allowing monitoring.