Spring Boot 2.2.2 - Prometheus not working in Actuator - spring-boot

Question

I've upgraded my Spring Boot application to the latest 2.2.2 Boot version. Since then, I only have a metrics endpoint but no Prometheus.
My build.gradle.kts file has org.springframework.boot:spring-boot-starter-actuator as dependency, I also added io.micrometer:micrometer-registry-prometheus as the reference suggests (Prometheus endpoint).
My application.yml looks like the following:
management:
server:
port: 9000
endpoints:
web:
exposure:
include: health, shutdown, prometheus
endpoint:
shutdown:
enabled: true
Can someone guide me to the right direction?
Edit: It was working in Spring Boot 2.2.0. This is the link to download an identical project: link
Edit 2: I can verify that it works with 2.2.1 as well.

Answer 1

I followed your setup, I created a project from this project loaded Spring Boot 2.2.2.RELEASE, I added the following dependency for Prometheus
implementation("io.micrometer:micrometer-registry-prometheus")
Also I added the following configuration in application.yml
management:
server:
port: 9000
endpoints:
web:
exposure:
include: health, shutdown, prometheus
endpoint:
shutdown:
enabled: true
When the application starts you will see the following info which shows you that 3 endpoints are exposed (health, shutdown and prometheus).
2020-01-05 23:48:19.489 INFO 7700 --- [ main] o.s.b.a.e.web.EndpointLinksResolver : Exposing 3 endpoint(s) beneath base path '/actuator'
And used Postman for method GET this endpoint http://localhost:9000/actuator/prometheus and it works well. I created a repository by following these steps here So please let me know what error is displayed, or what happens when you don't get the expected result so that I can help and edit this answer.

Answer 2

Add below maven dependency for prometheus
<dependency>
<groupId>io.micrometer</groupId>
<artifactId>micrometer-registry-prometheus</artifactId>
<scope>runtime</scope>
</dependency>
In application.yml, add the below configuration
management:
endpoints:
web:
exposure:
include: "*"
endpoint:
health:
show-components: always
show-details: always
probes:
enabled: true
Now you could see the below message when you restart the server
Exposing 15 endpoint(s) beneath base path '/actuator'
Access the prometheus url: http://localhost:8080/actuator/prometheus