Spring Boot Monitoring with Actuator 2

Question 1

Which Spring Boot Actuator endpoint returns a live application status suitable for Kubernetes liveness probes?

Accepted Answer

/actuator/health/liveness

Answer

The /actuator/health/liveness endpoint maps to the liveness state and is designed for Kubernetes liveness probes.

Question 2

What property enables all Actuator endpoints to be exposed over HTTP in Spring Boot 2.x?

Accepted Answer

management.endpoints.web.exposure.include=*

Answer

Setting management.endpoints.web.exposure.include=* exposes all available endpoints over HTTP.

Question 3

Which Actuator endpoint provides a trace of the last HTTP requests received by the application?

Accepted Answer

/actuator/httptrace

Answer

The /actuator/httptrace endpoint (renamed to /actuator/httpexchanges in Spring Boot 3) shows recent HTTP request-response exchanges.

Question 4

How do you create a custom HealthIndicator in Spring Boot?

Accepted Answer

Implement the HealthIndicator interface and register it as a Spring bean

Answer

Implementing the HealthIndicator interface and registering the class as a Spring bean automatically adds it to the /health endpoint.

Question 5

Which Micrometer metric type is best for measuring the duration of a database query?

Accepted Answer

Timer

Answer

A Timer measures both the count and total time of short-duration events like database queries.

Spring Boot Practice Test