Spring Boot Monitoring with Actuator Questions and Answers

Question 1

A developer wants to expose only the `health` and `info` Actuator endpoints over HTTP for external monitoring, while keeping all other endpoints hidden for security.
Which configuration in `application.properties` achieves this?

Accepted Answer

management.endpoints.web.exposure.include=health,info

Answer

management.endpoints.web.exposure.exclude=*

Answer

management.endpoints.web.enabled-by-default=false
management.endpoint.health.enabled=true
management.endpoint.info.enabled=true

Answer

endpoints.web.exposure=health,info

Question 2

What is the primary role of Micrometer in the context of Spring Boot Actuator?

Accepted Answer

To provide a vendor-neutral application metrics facade.

Answer

To secure Actuator endpoints with authentication and authorization.

Answer

To create custom health indicators for the `/health` endpoint.

Answer

To expose Spring beans and application properties via JMX.

Question 3

An operations team needs to access Actuator endpoints on a separate, dedicated port (e.g., 9090) to simplify network firewall rules, keeping them separate from the main application port (e.g., 8080). Which property should be set in `application.properties`?

Accepted Answer

management.server.port=9090

Answer

server.management.port=9090

Answer

actuator.port=9090

Answer

server.port.management=9090

Question 4

A developer needs to add a custom check to the `/actuator/health` endpoint to verify the status of a critical downstream microservice. Which of the following is the standard Spring Boot approach?

Accepted Answer

Create a bean that implements the `HealthIndicator` interface.

Answer

Define a new `@RestController` with a path of `/actuator/health/custom`.

Answer

Add properties prefixed with `management.health.custom.*` to `application.properties`.

Answer

Implement the `ApplicationRunner` interface to perform the check on startup.

Question 5

Which Actuator endpoint provides a detailed list of all Spring beans currently in the ApplicationContext, including their scope, type, and dependencies?

Accepted Answer

/actuator/beans

Answer

/actuator/env

Answer

/actuator/mappings

Answer

/actuator/configprops

Question 6

How can a developer contribute static application metadata, such as a version number and description, to the `/actuator/info` endpoint using only the `application.properties` file?

Accepted Answer

By setting properties prefixed with `info.*`

Answer

By setting properties prefixed with `management.info.*`

Answer

By creating a bean that implements `InfoContributor`

Answer

By using the `@Info` annotation on the main application class