Spring Boot Actuator — Spring Technical Interview Questions & Answers

Production-ready health, metrics and info endpoints.

Spring Boot Actuator

  • Actuator adds ready-made endpoints to check if your app is healthy and how it is performing.
  • Add spring-boot-starter-actuator.
  • Popular endpoints: /actuator/health, /actuator/metrics, /actuator/info.
  • Ops use: Load balancers and Kubernetes check health.
  • Security: Do not expose sensitive endpoints publicly without protection.
  • Opening all actuator endpoints on the public internet.
  • Actuator = production monitoring endpoints out of the box.

Technical Interview Tip: Name health/metrics and mention securing endpoints.

Code Examples for Spring Boot Actuator

Spring Boot Actuator — working example

# application.properties
management.endpoints.web.exposure.include=health,info,metrics
management.endpoint.health.show-details=when_authorized

// Dependency: spring-boot-starter-actuator
// Then GET /actuator/health → {"status":"UP"}

Spring Boot Actuator — actuator exposes ops endpoints (health, metrics) for production visibility.

How to Explain Spring Boot Actuator to an Interviewer

What is Boot Actuator (sb)?

Used for a short Boot Actuator sb example a small REST app Not just the heading

Give one small example of Boot Actuator (sb).

the smallest Boot Actuator sb example you can type Production-ready health, metrics and info endpoints

What mistake do beginners make with Boot Actuator (sb)?

only saying “Boot Actuator sb” with no example Show the fix

Where do you use Boot Actuator (sb)?

a small REST app a short Boot Actuator sb example