Hibernate statistics are not exposed even if corresponding configuration are applied

[klopfdreh]

Description:
As mentioned in the title, the hibernate statistics are not exposed even if I set the property spring.jpa.properties.hibernate.generate_statistics=true in the application.yaml / application.properties

Release versions:
2.9.1

Steps to reproduce:

1. Just start the server and set the following properties in the application.yml / application.properties.
   yaml-example:

    management:
      endpoints:
        prometheus:
          enabled: true
        web:
          exposure:
            include: "*"
        jmx:
          exposure:
            include: "*"
      metrics:
        tags:
          application: scdf_server
        export:
          prometheus:
            enabled: true
            rsocket:
              enabled: true
              host: localhost
              port: 7001
    spring:
        jpa:
          properties:
            hibernate:
              dialect: <yourdialect>
              generate_statistics: true

2. Access http://localhost:9393/management/prometheus and search for example for hibernate_query_executions_max_seconds.
3. According to hibernate this should show the query executions max seconds, but this and other properties are not exposed.

Note: I double checked if "spring" is applied on the same level as server and management.
Note2: This was working till version 2.9.0

[klopfdreh]

Because the statistics generation of hibernate has been moved to the hibernate project org.hibernate:hibernate-micrometer I guess this dependency has to be added to the classpath. See: https://docs.spring.io/spring-boot/docs/2.7.8/reference/htmlsingle/#actuator.metrics.supported.hibernate

I am going to try this out and report back if this is working.

[klopfdreh]

Good news - that was the issue here - see the result:

Just add the following dependency to the pom.xml (https://github.com/spring-cloud/spring-cloud-dataflow/blob/main/spring-cloud-dataflow-server/pom.xml)

<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-micrometer</artifactId>
</dependency>

application.yml:

spring:
  jpa:
    properties:
      hibernate:
        generate_statistics: true

[onobc]

Awesome find @klopfdreh ! Thanks for this. We will also make sure we have test coverage in this area of the metrics so that we find it before it goes out.