Introduction

Exposes operational information about app
Acts as the bridge between Spring Boot app and monitoring tools
**Auto-configured (**Zero or minimal code) built-in endpoints for:

Endpoint	Purpose
`/actuator/health`	App health
`/actuator/info`	App info
`/actuator/metrics`	Available metrics
`/actuator/prometheus`	Metrics for Prometheus
`/actuator/env`	Environment variables
`/actuator/beans`	Spring beans
`/actuator/threaddump`	Thread dump
`/actuator/loggers`	Logging levels

/actuator/health – Health Checks

Example response:

{
	"status":"UP",
	"components":{
		"db":{
			"status":"UP"
		},
		"diskSpace":{
			"status":"UP"
		}
	}
}

Health Status Meaning

Status	Meaning
UP	Healthy
DOWN	Not healthy
OUT_OF_SERVICE	Disabled
UNKNOWN	Cannot determine

SpringBoot setup

pom.xml

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>

application.yml