Spring-Boot-Actuator Endpoint Prometheus not shown correctly - spring

Question

I want to show some metrics using micrometer prometheus in combination with the spring-boot-actuator. My project is totally based on spring-boot and has the actuator feature enabled and mapped on the following url: http://localhost:9000/actuator
Other endpoints are shown correctly but the http://localhost:9000/actuator/prometheus isn´t. Below you find a screenshot that I get when accessing this http-endpoint.
Can anybody help me? Why is this happening and how do i fix it?
Cause normally prometheus is configured automatically for spring-boot-actuator when you provide the suitable dependency.

Answer 1

you need to check many things to be sure to enable Prometheus by Actuator
First thing you should put the following dependency on your pom.xml to enable Prometheus on your project.
<!-- enable prometheus-->
<dependency>
<groupId>io.micrometer</groupId>
<artifactId>micrometer-registry-prometheus</artifactId>
<version>1.10.2</version>
</dependency>
The second point you must check if the actuator exists on your
project or not if doesn't exist, you need to add the following
dependency.
<!--to enable actuator help to trace project-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
You need to add the following scripts to your application.yml to
enable the actuator and Prometheus by actuator.
.
management:
security:
enabled: false
server:
port: 9000
endpoint:
metrics:
enabled: true
prometheus:
enabled: true
health:
show-details: always
show-components: always
probes:
enabled: true
shutdown:
enabled: true
info:
env:
enabled: true
enabled: true
endpoints:
web:
exposure:
include: prometheus, metrics, info, health, shutdown, beans
using the above script the actuator will run on port 9000 and you can send a request to the following URL to access the actuator.
http://localhost:9000/actuator/prometheus
and the following URL to access Prometheus
http://localhost:9000/actuator/prometheus
Note: you must check where you are writing your script because I was confused between endpoint and endpoints
The endpoint to set the actuator config.
The endpoints to set the actuator URLs endpoint
Note: you can delete the port from application.yml and the actuator will run by current application port
best luck

Answer 2

This is auto-cofigured by default, here are some pointers for troubleshooting:
Check if you added micrometer-registry-prometheus (without defining the version, the version should come from the BOM)
Check if the actuator endpoint is enabled: management.endpoints.web.exposure.include=*
Check if there is a controller that maps the path of the prometheus endpoint or any of its sub-paths (/, /actuator, /actuator/prometheus)
Check if you browser tricks you curl localhost:9090/actuator/prometheus

Answer 3

ok i solved it with the solution:
i created a bean of type prometheusMeterRegistry manually and so spring boot didn't configure it automatically leading to no metrics provided at the prometheus endpoint
see below code snippet for further details:
// #Bean
// public PrometheusMeterRegistry prometheusMeterRegistry() {
// return new PrometheusMeterRegistry(PrometheusConfig.DEFAULT);
// }

Answer 4

In my case I was trying to set up prometheus on old project where was MetricsAutoConfiguration excluded. So removing exclude solved the problem.
#EnableAutoConfiguration(exclude = { MetricsAutoConfiguration.class})