Can you list some of the endpoints provided by Spring Boot Actuator?

Question

Accepted Answer

Spring Boot Actuator exposes a set of built-in HTTP endpoints under /actuator that provide monitoring and management insight into a running application.

Key Points:
• /actuator/health reports the application's up/down status and can aggregate downstream dependency checks.
• /actuator/info surfaces custom build and application metadata.
• /actuator/metrics exposes runtime metrics like memory usage, HTTP request counts, and JVM stats, often scraped by Prometheus.
• /actuator/env lists the active configuration properties and their sources.
• /actuator/loggers lets you view and change log levels at runtime without restarting the app.
• Most endpoints are disabled by default except health and info, and must be explicitly enabled and secured.

Example:
Hitting GET /actuator/health in production returns {"status":"UP"}, which a load balancer or Kubernetes liveness probe can poll to decide whether to keep routing traffic to that instance.

Code Example:
```
# application.yml
management:
  endpoints:
    web:
      exposure:
        include: health,info,metrics,loggers
  endpoint:
    health:
      show-details: always
```

Interview Tip:
A concise interview answer is:

"Actuator gives you endpoints like /health, /info, /metrics, /env, and /loggers out of the box, which cover status checks, build metadata, runtime metrics, active configuration, and live log-level changes. I always lock down which ones are exposed and add authentication before shipping to production, since some leak sensitive details."