Spring Boot 2 - Actuator Metrics Endpoint not working

Question

In my Spring Boot App (2.0.0.M7) application.properties I set

management.endpoint.metrics.enabled=true

However, when i hit

localhost:8080/actuator/metrics 

I get 404.

Whats the solution?

Answer 1

I would like to enhance the OP's answer with more information as I struggled a bit before finally stumbling upon this solution and there seem to be lots of confusion about changes to actuator behavior with Spring Boot 2

What hasn't changed

You need to include a dependency to spring-boot-starter-actuator

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

If you want to access actuator endpoints via HTTP, you also need to add a dependency to spring-boot-starter-web

So your pom dependencies will look like below

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

Changes introduced in Spring Boot 2

1. Endpoints like /health, /metrics etc. are no longer available at the default root context. They are available from now on at http://{host}:{port}/actuator. Also, it doesn't matter whether your application's all other endpoints begin with some other context such as /hello -- actuator is available at /actuator and not at /hello/actuator.

2. Response from /actuator endpoint is by default HATEOAS enabled. Prior to Spring Boot 2, this was the case only if HATEOAS is on the classpath and explicitly enabled in application.yml

3. To make an actuator endpoint available via HTTP, it needs to be both enabled and exposed.

   By default:

   • only the /health and /info endpoints are exposed, regardless of Spring Security being present and configured in your application.

   • all endpoints but /shutdown are enabled (though only /health and /info are exposed)

4. If you want to expose all of the endpoints (not always a good idea), you may do so by adding management.endpoints.web.exposure.include=* to application.properties. Don't forget to quote the wildcard if you're using yml-configurations.

5. Old properties starting with endpoints.xyz are deprecated in favor of properties starting with management.xyz

For a full documentation, see official doc and also the migration guide