Spring Boot Monitoring with Actuator 5

Question 1

What happens when you annotate a method with @Timed from Micrometer in a Spring Boot application?

Accepted Answer

The method execution time is automatically recorded as a Timer metric

Answer

@Timed (with AspectJ support enabled) wraps the method invocation and records its duration in a Micrometer Timer.

Question 2

Which property disables a specific Actuator endpoint, for example the shutdown endpoint?

Accepted Answer

management.endpoint.shutdown.enabled=false

Answer

Individual endpoints are toggled with management.endpoint.<endpoint-name>.enabled=false.

Question 3

What is the purpose of the /actuator/mappings endpoint?

Accepted Answer

Displays all @RequestMapping routes registered in the application along with their handler details

Answer

The /actuator/mappings endpoint enumerates every request handler mapping, including path patterns, HTTP methods, and handler classes.

Question 4

How do you secure Actuator endpoints using Spring Security so only users with the ADMIN role can access them?

Accepted Answer

Configure a SecurityFilterChain that matches /actuator/** and requires ROLE_ADMIN

Answer

Defining a SecurityFilterChain bean with .requestMatcher(EndpointRequest.toAnyEndpoint()).hasRole("ADMIN") restricts all Actuator endpoints.

Question 5

Which Actuator endpoint triggers a graceful application shutdown when HTTP POST is sent to it?

Accepted Answer

/actuator/shutdown

Answer

POSTing to /actuator/shutdown initiates a graceful shutdown; this endpoint is disabled by default for safety.

Spring Boot Practice Test